I had been using RSS Bandit, and I was pretty satisfied, but I’m using Sauce Reader now, and it is just amazing. No longer do I even have to click on a title to read a post, because it previews them for me. I can now easily post to my own blog right from the reader and write comments right from the reader. I know this is possible with other readers, but it is completely intuitive with Sauce Reader.
It also looks just like the Outlook 2003 UI.