When reading your RSS feeds, do you prefer a local application versus one that is online-only? If so, look no further than ShareFire. Besides being platform-independent (courtesy of Adobe Air), it is also completely free and open-source. It was created with article sharing in mind, as its name implies. According to its creators, Christian Cantrell and Dan Koestler, this was a priority.
ShareFire supports sharing stories to AIM, Twitter and email, and posting articles to many services including Delicious, Digg, MySpace and Windows Live Bookmarks (now called favorites).