Use GoodSearch to donate to your charity. Select the charity, then use GoodSearch for your internet searches.
Houston Dominican Sisters is a great choice to donate to. ;)
update: Anonymous commenter also suggested http://www.click4carbon.com/ as another good search engine that benefits charity. However, you know I'm biased for the Dominicans. But it's all good.
Thanks commenter! Apparently once in a while someone does skim through this blog.