diff --git a/lib/WebGUI/Asset.pm b/lib/WebGUI/Asset.pm
index 6e19ca64b..3df9e9c77 100644
--- a/lib/WebGUI/Asset.pm
+++ b/lib/WebGUI/Asset.pm
@@ -2036,6 +2036,19 @@ sub www_manageAssets {
 
 #-------------------------------------------------------------------
 
+=head2 getContentLastModified
+
+Returns the overall modification time of the object and its content in Unix epoch format, for the purpose of the Last-Modified HTTP header.  Override this for subclasses that contain content that is not solely dependent on the revisionDate of the asset.
+
+=cut
+
+sub getContentLastModified {
+	my $self = shift;
+	return $self->get("revisionDate");
+}
+
+#-------------------------------------------------------------------
+
 =head2 www_view ( )
 
 Returns the view() method of the asset object if the requestor canView.
diff --git a/lib/WebGUI/Asset/Wobject.pm b/lib/WebGUI/Asset/Wobject.pm
index 1e3943e35..227a51d4f 100644
--- a/lib/WebGUI/Asset/Wobject.pm
+++ b/lib/WebGUI/Asset/Wobject.pm
@@ -505,8 +505,8 @@ sub www_view {
 	my $self = shift;
 	my $check = $self->checkView;
 	return $check if (defined $check);
-	$self->session->http->setLastModified($self->get("revisionDate"));
-	$self->session->http->sendHeader;	
+	$self->session->http->setLastModified($self->getContentLastModified);
+	$self->session->http->sendHeader;
 	$self->prepareView;
 	my $style = $self->processStyle("~~~");
 	my ($head, $foot) = split("~~~",$style);
diff --git a/lib/WebGUI/Asset/Wobject/EventManagementSystem.pm b/lib/WebGUI/Asset/Wobject/EventManagementSystem.pm
index 17df01eb0..f1be1990f 100644
--- a/lib/WebGUI/Asset/Wobject/EventManagementSystem.pm
+++ b/lib/WebGUI/Asset/Wobject/EventManagementSystem.pm
@@ -2326,7 +2326,7 @@ sub www_editEventMetaDataField {
 	my $i18n2 = WebGUI::International->new($self->session,'Asset_EventManagementSystem');
 	my $i18n = WebGUI::International->new($self->session,"WebGUIProfile");
 	my $f = WebGUI::HTMLForm->new($self->session, (
-		action => $self->getUrl."?func=editEventMetaDataFieldSave;fieldId=".$fieldId
+		action => $self->getUrl("func=editEventMetaDataFieldSave;fieldId=".$fieldId)
 	));
 	my $data = {};
 	if ($error) {
@@ -3226,7 +3226,7 @@ sub www_editPrereqSet {
 	return $self->session->privilege->insufficient unless ($self->canAddEvents);
 	my $i18n = WebGUI::International->new($self->session,'Asset_EventManagementSystem');
 	my $f = WebGUI::HTMLForm->new($self->session, (
-		action => $self->getUrl."?func=editPrereqSetSave;psid=".$psid
+		action => $self->getUrl("func=editPrereqSetSave;psid=".$psid)
 	));
 	my $data = {};
 	if ($error) {
@@ -3356,7 +3356,7 @@ sub www_editRegistrant {
 	return $self->session->privilege->insufficient unless ($self->canAddEvents);
 	my $i18n = WebGUI::International->new($self->session,'Asset_EventManagementSystem');
 	my $f = WebGUI::HTMLForm->new($self->session, (
-		action => $self->getUrl."?func=editRegistrantSave;badgeId=".$badgeId
+		action => $self->getUrl("?func=editRegistrantSave;badgeId=".$badgeId)
 	));
 	my $data = {};
 	if ($error) {
@@ -3607,7 +3607,7 @@ sub www_editDiscountPass {
 	return $self->session->privilege->insufficient unless ($self->canAddEvents);
 	my $i18n = WebGUI::International->new($self->session,'Asset_EventManagementSystem');
 	my $f = WebGUI::HTMLForm->new($self->session, (
-		action => $self->getUrl."?func=editDiscountPassSave;passId=".$passId
+		action => $self->getUrl("func=editDiscountPassSave;passId=".$passId)
 	));
 	my $data = {};
 	if ($error) {
diff --git a/lib/WebGUI/Asset/Wobject/Layout.pm b/lib/WebGUI/Asset/Wobject/Layout.pm
index 84ff9af6c..903508316 100644
--- a/lib/WebGUI/Asset/Wobject/Layout.pm
+++ b/lib/WebGUI/Asset/Wobject/Layout.pm
@@ -273,6 +273,18 @@ sub www_setContentPositions {
 	return "Map set: ".$self->session->form->process("map");
 }
 
+#-------------------------------------------------------------------
+sub getContentLastModified {
+        # Buggo: this is a little too conservative.  Children that are hidden maybe shouldn't count.  Hm.
+	my $self = shift;
+	my $mtime = $self->get("revisionDate");
+	foreach my $child (@{$self->getLineage(["children"],{returnObjects=>1, excludeClasses=>['WebGUI::Asset::Wobject::Layout']})}) {
+		my $child_mtime = $child->getContentLastModified;
+		$mtime = $child_mtime if ($child_mtime > $mtime);
+	}
+	return $mtime;
+}
+
 #-------------------------------------------------------------------
 sub www_view {
 	my $self = shift;
@@ -296,7 +308,7 @@ sub www_view {
 			my $ad = $adSpace->displayImpression if (defined $adSpace);
 			$out =~ s/\Q$code/$ad/ges;
 		}
-		$self->session->http->setLastModified($self->get("revisionDate"));
+		$self->session->http->setLastModified($self->getContentLastModified);
 		$self->session->http->sendHeader;	
 		$self->session->output->print($out, 1);
 		return "chunked";	
diff --git a/lib/WebGUI/Asset/Wobject/SyndicatedContent.pm b/lib/WebGUI/Asset/Wobject/SyndicatedContent.pm
index 64d8224ee..fe782be4b 100644
--- a/lib/WebGUI/Asset/Wobject/SyndicatedContent.pm
+++ b/lib/WebGUI/Asset/Wobject/SyndicatedContent.pm
@@ -80,7 +80,22 @@ sub _createRSSURLs {
 	$var->{'rss.url'}=$self->getUrl('func=viewRSS20');
 }
 
+#-------------------------------------------------------------------
+sub _getMaxHeadlines {
+	my $self = shift;
+	return $self->get('maxHeadlines') || 1000000;
+}
 
+#-------------------------------------------------------------------
+sub _getValidatedUrls {
+	my $self = shift;
+	my @urls = split(/\s+/,$self->get('rssUrl'));
+	my @validatedUrls = ();
+	foreach my $url (@urls) {
+		push(@validatedUrls, $url) if ($url =~ m/^http/);
+	}
+	return @validatedUrls
+}
 
 #-------------------------------------------------------------------
 
@@ -289,6 +304,11 @@ sub _get_rss_data {
                 }
                 my $xml = $response->content();
 
+		# Approximate with current time if we don't have a Last-Modified
+		# header coming from the RSS source.
+		my $http_lm = $response->last_modified;
+		my $last_modified = defined($http_lm)? $http_lm : time;
+
 		# XML::RSSLite does not handle <![CDATA[ ]]> so:
                 $xml =~ s/<!\[CDATA\[(.*?)\]\]>/$1/sg;
  
@@ -341,6 +361,9 @@ sub _get_rss_data {
 		#correctly as new items appear.
 		_assign_rss_dates($session, $rss->{items});
 
+		# Store last-modified date as well.
+		$rss->{last_modified} = $last_modified;
+
                 #Default to an hour timeout
                 $cache->set(Storable::freeze($rss), 3600);
         }
@@ -475,13 +498,21 @@ sub _get_items {
 	my $displayMode=$self->getValue('displayMode');
 
 	my $hasTermsRegex=_make_regex($self->getValue('hasTerms'));
-	
-	my $key=join(':',('aggregate', $displayMode,$hasTermsRegex,$maxHeadlines,$self->get('rssUrl')));
+
+	# Cache format changes:
+	#   - aggregate: $items
+	#   - aggregate2 (2006-08-26): [$items, \@rss_feeds]
+
+	my $key=join(':',('aggregate2', $displayMode,$hasTermsRegex,$maxHeadlines,$self->get('rssUrl')));
 
         my $cache = WebGUI::Cache->new($self->session,$key, 'RSS');
-        my $items = Storable::thaw($cache->get());
-	my @rss_feeds;
-        if (!$items) {
+        my $cached = Storable::thaw($cache->get());
+	my ($items, @rss_feeds);
+
+	if ($cached) {
+		$items = $cached->[0];
+		@rss_feeds = @{$cached->[1]};
+	} else {
                 $items = [];
 
                 for my $url (@{$urls}) {
@@ -506,8 +537,8 @@ sub _get_items {
 
                 #@{$items} = sort { $b->{date} <=> $a->{date} } @{$items};
 
-                $cache->set(Storable::freeze($items), 3600);
-	    }
+                $cache->set(Storable::freeze([$items, \@rss_feeds]), 3600);
+	}
 
 	#So return the item loop and the first RSS feed, because 
 	#when we're parsing a single feed we can use that feed's title and 
@@ -567,12 +598,8 @@ sub view {
 		my $out = WebGUI::Cache->new($self->session,"view_".$self->getId)->get;
 		return $out if $out;
 	}
-        my $maxHeadlines = $self->get('maxHeadlines') || 1000000;
-        my @urls = split(/\s+/,$self->get('rssUrl'));
-	my @validatedUrls = ();
-	foreach my $url (@urls) {
-		push(@validatedUrls, $url) if ($url =~ m/^http/);
-	}
+        my $maxHeadlines = $self->_getMaxHeadlines;
+	my @validatedUrls = $self->_getValidatedUrls;
 	return $self->processTemplate({},$self->get('templateId')) unless (scalar(@validatedUrls));
 	my $title=$self->get('title');
 
@@ -621,6 +648,32 @@ sub view {
 
 }
 
+#-------------------------------------------------------------------
+
+=head2 getContentLastModified ( )
+
+Derive the last-modified date from the revisionDate of the object and from the dates of the RSS feeds.
+
+=cut
+
+sub getContentLastModified {
+	# Buggo, is this too expensive?  Do we really want to do this every time?
+	# But how else are we supposed to get a reasonable last-modified date?
+	# Maybe just approximate... ?
+	my $self = shift;
+
+	my $maxHeadlines = $self->_getMaxHeadlines;
+	my @validatedUrls = $self->_getValidatedUrls;
+	my ($item_loop, $rss_feeds) = $self->_get_items(\@validatedUrls, $maxHeadlines);
+	my $mtime = $self->get("revisionDate");
+
+	foreach my $rss (@$rss_feeds) {
+		next unless defined $rss->{last_modified};
+		$mtime = $rss->{last_modified} if $rss->{last_modified} > $mtime;
+	}
+
+	return $mtime;
+}
 
 #-------------------------------------------------------------------
 
diff --git a/lib/WebGUI/Cache/Database.pm b/lib/WebGUI/Cache/Database.pm
index 7ca759096..805b35f04 100644
--- a/lib/WebGUI/Cache/Database.pm
+++ b/lib/WebGUI/Cache/Database.pm
@@ -103,7 +103,8 @@ sub get {
 	$sth->finish;
 	my $content = $data->[0];
 	return undef unless ($content);
-	return thaw($content);
+	# Storable doesn't like non-reference arguments, so we wrap it in a scalar ref.
+	return ${thaw($content)};
 }
 
 #-------------------------------------------------------------------
@@ -170,7 +171,8 @@ The time to live for this content. This is the amount of time (in seconds) that
 
 sub set {
 	my $self = shift;
-	my $content = freeze(shift);
+	# Storable doesn't like non-reference arguments, so we wrap it in a scalar ref.
+	my $content = freeze(\(scalar shift));
 	my $ttl = shift || 60;
 	my $size = length($content);
 	# getting better performance using native dbi than webgui sql
diff --git a/sbin/preload.perl b/sbin/preload.perl
index 32ea62b35..f174e647b 100644
--- a/sbin/preload.perl
+++ b/sbin/preload.perl
@@ -52,7 +52,16 @@ foreach my $package (@modules) {
 }
 
 use Apache2::ServerUtil ();
-Apache2::ServerUtil->server->add_version_component("WebGUI/".$WebGUI::VERSION);
+{
+    # Add WebGUI to Apache version tokens
+    my $server = Apache2::ServerUtil->server;
+    my $sub = sub {
+	$server->add_version_component("WebGUI/".$WebGUI::VERSION);	
+    };
+    $server->push_handlers(PerlPostConfigHandler => $sub);
+}
+
+
 use APR::Request::Apache2 ();
 use Apache2::Cookie ();