Snackr is a simple and lightweight RSS reader that runs on Adobe Air. You can have it displayed on the bottom or top corner of your screen display (left and right side as well). It looks cool and you get your quick dose of RSS all the time.
Snackr isn’t really a complete replacement to your regular RSS reader (mine’s FeedDemon and Netvibes). I think it’s supposed to complement whatever existing reader you normally use — only advantage I see aside from the aesthetic value is that it will push those rapid-updating sources right in front of you as they come out.
See screenshot of how it looks in your screen above. If you like it, you can download a copy of Snackr here.