Here's a list of places to donate. Here's the US gov't list of aid agencies (my favorite at the moment is the Clinton Bush Haiti Fund, because it gives 100% of donations straight to need (overhead is funded by the ex-prezs' foundations, I believe).
EDIT: Here's a great charity evaluator site to help weed through your options.
As always, remember that those easy-to-use cell-phone donation programs cost more than website donations, because there's one more intermediary sucking down some of the donation (credit-card company + cell-phone company), and the agency doesn't get the money until the phone company pays - usually after you pay your bill - so direct donations reach your chosen cause faster, too.
Chris
