FeedDemon is hands down my favorite rss aggregator, but I've used it less over the last year because I've been using Onfolio (despite the fact that it's way slower than FD.) I liked the integration of Onfolio and Firefox, and the ability to blog items right out of Onfolio. However, upgrading to FF v1.5 broke Onfolio... so I'm back to using FD because I can't seem to take advantage of Onfolio.
Seeing that Bradbury is testing a new version and has an alpha of v2 with a totally new UI is exciting. One feature that I really really like is the ability to see the blogs that I pay most attention to. Nick's comments about the backlash against subscription pricing are also interesting, while I like the fact that I can pay a onetime license for this software I still wish I could get newsgator integration (to NG Online) without ponying up for a subscription to NG.