This is worth mentioning....
Sage: a feed reader for Firefox
Sage is a lightweight RSS and Atom feed reader extension for Mozilla Firefox.
Google reader is good, but it's still got some usability issues, mainly that the default page/interface only gives a list of unread posts, where as sometimes you only want to see (or hide) a specific feed. Obviously the downside with sage is you need firefox, but who's not using firefox ;)