Awesome. I started using it with the Facebook developer forums feed, which has only the titles of each post, and it's a great improvement. The one thing it can't do well, though, is following the thread messages. Basically, a thread shows up in the feed several times, once for each message, and your feed is showing only the first message again and again.

Parsing forum feeds is probably what you designed it for, but if you can support that, it would definitely be a great improvement. Here is the feed I'm talking about:

http://forum.developers.facebook.com/rss.php