im not sure how old this search engine is, but theres a search engine called dogpile.com that is raising money for animal shelters. they hope to have raised 1 million$ by the end of 2009 for the aspca. for every search done through dogpile.com they will set aside a portion of their revenues for the aspca.
pass it on and ask your friends and family to search with dogpile

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(as of this posting theyre up to almost $146K)