A better RSS reader!
Apple already offers pretty good RSS readers with Safari and Mail. A dedicated RSS applications can be useful and most of the time offers more features however. One that I particularly like is NetNewsWire. It really looks like a Mac application and it has that shiny iTunes look. It previously wasn't free but it is now a freeware. It has a great integration with applications such as Address Book, iCal, iPhoto and even Growl. When you find an article interesting, it will also let you load the web page directly in the application. It even supports tabbed browsing. You can learn more or download NetNewsWire here from MacUpdate.