No doubt this is known to many of you, but I thought it sounded neat enough to mention here anyway.
This search site, GoodSearch, uses Yahoo to do its searching, but every time you use their site, their advertisers donate money to a cause that YOU select. It costs you, the user, nothing, yet is a way for you to support your favorite charity or cause.
They have a long list of known charities, or you can inform them of the one you wish to support. You can download their toolbar, or just search from the main site.
Read more about it at:
www.goodsearch.com