Tokogae
Tokogae is a philanthropic search engine. Any ad revenue generated from performing searches through Tokogae is donated to a charity selected by the user.
Although the design is clean and fresh, the interface boasts some flashy Javascript and AJAX. The effects are courtesy of the extremely popular Scriptaculous library and the charity is stored using a cookie.
Unfortunately, the modus operandi is technically against Google's Terms of Service. However, I have plans to change the Google search to Yahoo Boss in the future.