Various sources (Acorn, Brij et al) point to the Tsunami blog set up by few folks to aggregate the information about Tsunami relief efforts.

This link points to the list of important telephone numbers on the Tsunami blog.

Also contribute to the relief efforts in whatever way you can. Ram Dhan has made it very easy by setting up a site to contribute by Paypal. Click the link below to find more

Contribute via Paypal on Ram Dhan’s Site