There are a number of good charities out there but if you're stumped, consider Mercy Corps based out of Portland, Oregon. A friend of mine is the head of their communications division and she's overseas right now as part of the relief effort (and was interviewed on "Dateline" last night).
Mercy Corps was also featured on the front page of today's "New York Times" as part of a small group of charities that's spending some of their money hiring local, displaced people to help clean up and rebuild. www.mercycorps.org
It's a good group and not just because a friend works there.
One of my brothers is going over to Indonesia tomorrow with Qualcomm (his company). They've been involved in relief efforts, too, but they certainly don't need any money.