This is a good idea that makes use of the everyday, well at least an everyday online activity. GoodSearch is a site that lets you designate a charity that you’d like to donate to and a portion of ad revenue made from your search goes to the charity you specified. It appears to allow only USA-based charities benefit for now.
“GoodSearch is a search engine which donates 50 percent of its revenue to the charities and schools designated by its users. It’s a simple and compelling concept. You use GoodSerach exactly as you would any other search engine and it is powered by Yahoo! so you get proven search results. The money GoodSearch donates to your cause comes from its advertisers — the users and the organizations do not spend a dime!”