My two faves were Technorati and Topix. I liked the layout and more importantly when I typed in a topic, the search actually yielded pertinent info. The polls and comments people posted on Topix made me laugh. Feedster did not seem to return results with any resemblance to what I was looking for.
I found the Bloglines search tool simple and easy to use. Syndic8 was probably trying to go for the minimalist look but I thought it was just ugly. C'mon websites should be functional and inviting. But then I guess I'm pretty much burnt out on feeds at this point.