I'm using the 0.7 Beta of Flock, and I am pretty much completely wowed. It is pretty much the most amazing RSS reader I've used yet, and it integrates seemlessly with Flickr and del.icio.us and many blogging APIs. I highly recommend you give it a look if you're into the more interactive side of the internet. I love it, and it's not even released yet.
http://flock.com/