RSS Readers

Had I had decent stats in my blog, I wouldn't have to ask these questions, hehe ... what RSS readers are you using? Web based, software based? I tried a few.. I was using Sage RSS for Firefox for a while, but it wasn't portable enough ... then I tried like 10 different software based, and the one I like the most is SharpReader ... it's simple and non-intrusive... I don't like the web based one as much. SharpReader allows to export and import OPML files, and it allows for unlimited levels to categorize your feeds, feature that although I assumed basic, 9/10 programs I tried did not offer.
You can comment on aggregators for Mac too, though I don't use one, other users may find it informative.
What rss reader do you use? why?

p.s. not about stats ... I use google analytics, but that will cover rss feeds. I have available nettracker, but I haven't had time to set it up.