In addition to the list from the Bitcoin wiki is the list of charities in which donations through Witcoin can be made.
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http://witcoin.com/charitiesAny charity can register to be included. Those who post, vote or reply on witcoin can configure their Witcoin user account such that a certain percent of the proceeds they earn after post, reply or voting can be donated to one or more charities of their choosing.
I can also attest first hand to the fact that witcoin makes an effort to determine that the listed entities are actually affiliated with the listed addresses.