The markup can be still XHTML and made easier. I'd say throw in some Wiki formatting, or Markdown, or anything.

On the RSS feed, I think it'd be a rather easy hack to insert the actual post text (as description) and alter the title to, for instance, "[CPAN::Forum] RSS Feeds CPAN::Forum" (so with the actual module name in there). Easier would be to use a slightly different format. I think we'd better follow this up by email rather than posting here :) So drop me a line...