Asia and India got smashed. 76,000+ dead. The Earth's rotation sped up by 3 microseconds. Tectonic plates moved by 98 feet (they usually move about 1cm/year, I think). This was a big deal.
Slashdot has more of the technical news.
Google has set up a tsunami help page.
As has Amazon.
CNN has a clickable list of links to places you can donate.
I'm pretty sure the Red Cross has need of donations too, but their site seems slammed at the moment.
There's also a tsunami help blog.