A Good Search
GoodSearch, powered by Yahoo's search engines, contributes to your charity of choice each time you search. Cool. You get the same results you'd get in a Yahoo or Google search, but you can choose a new or stick with the same charity to benefit from each round of searches.
According to the site, GoodSearch was founded by a brother and sister who had lost their mom to cancer. Realizing that last year alone, search provided advertisers with more than 6 million bucks, GoodSearch is trying to direct that money to good causes.
You can enter a new cause or choose from a cause already registered with the site. Spread the Good word.