RSSLibJ now can generate RSS 3.0 feeds! There are still some issues with RSS 3.0 (it's a draft, after all) but we're actually on the bubble for once. I plan to add reading in RSS 3.0 sources soon.
RSSLibJ should be able to read and write RSS and RDF files properly; thus, beta testers are welcomed!
Next step: a better web site :)
The first gleanings of <a href="http://backend.userland.com/rss">RSS 2.0</a> support are in testing. This is for category support only; other elements will come in soon as we figure out how they're to be supported.