If you aren't clicking on the Animal Rescue Site, tsk, tsk, shame on you. I exercise my index a little more by 20 clicks a day on that one.
However, if you're less energetic and want to help your favorite charity/non-profit, then install the toolbar for a search engine I just discovered through Carolyn Howard-Johnson, my author friend,
which is www.goodsearch.com. You can enter your local humane society, homeless shelter, whatever, and every time you use it to search, you secure funds for that charity. It's a painless way of giving.