As of today a new plugin is available on CPAN, CGI::Wiki::Plugin::RSS::Reader. It uses LWP::Simple and XML::RSS to make it easy to embed RSS feeds into your wiki nodes.
my $rss = CGI::Wiki::Plugin::RSS::Reader->new( url => 'http://example.com/feed.rss' );
my @items = $rss->retrieve;
This will give you back an array of hashes each containing a pair of one feed item's title and its URL, suitable for inclusion in a macro. It can also be given a file path to an RSS file rather than an URL if so desired.
http://search.cpan.org/dist/CGI-Wiki-Plugin-RSS-Reader/