Cnet has an interesting article talking about the little search engines that could...that is take over search spotlight from Google, Yahoo, and MSN. Iv'e tried Eurekster and by far that's the most interesting one since it brings together your social networks and searching. The only problem I see is that different sets of friends in your circle serve different needs in your life and therefore could skew some of your searching.

"Search upstarts storm Google's gates", Stefanie Olsen, CNET