GoodSearch is a Yahoo-powered search engine that shares 50% of it’s revenues with a charity you can choose. You define which charity you want to support and then you just use it like a normal search engine. This means that each time you're doing an internet search you're contributing for a good cause. Know more about it here.
If you want to change your default search engine to this one, just click here and choose your browser. Then, go to your browser preferences and set GoodSearch as default.
Where does the money come from?
According to them,
Search engines make most of their money from companies that pay an advertising fee when users click on links during a search. At GoodSearch, we've developed a patent-pending way to track and direct these search-generated proceeds to charities. In other words, a portion of advertiser dollars (and not your own!) earned as a result of your search, are now passed along to the organization you've chosen to support.
Are you going to be a better person and start using this?