Shame to see someone go to all the effort... And not realise that every *Press installation has RSS built in, and enabled, as long as the owner doesnt hack it out..

Sometimes themes like WordPress.org's are not set up to expose such feeds, but they're definitely there:
Recent Posts: http://wordpress.org/extend/ideas/rss.php
Recent Topics: http://wordpress.org/extend/ideas/rss.php?topics=1