Scour search engine
Just found out about Scour a new search engine with a difference. You get results from Google, Yahoo! and MSN search on one page and you get to vote and comment on the results. Thus, you become part of a online social network. Best of all you are awarded points for your activity on the site, which can be redemmed later for Visa gift cards.
Scour originally started off as Aftervote.com, a search engine with an AJAX backbone. The new brand name - Scour, came about after it was was acquired by Internext media, owner and operator of the ABCSearch Network.
Right now it is still in Beta and I am looking forward to see how it does.