Caffeinated is a smartly designed Google Reader client for Mac
      
          Caffeinated 1.2.2 is a full-featured RSS client that pairs with Google Reader. It has has seamless integration with several third-party services including Twitter and Facebook, as well as "read later" services like Instapaper.                                             
http://rss.macworld.com/click.phdo?i=b8fe34127346e2e4612263e498ff14ef