This page contains information on how to donate, satellite imagery, news links, and links to hospitals. We'll probably update this with more resources as they become available.
Google MapMaker is a providing data directly to the UN for relief operations, so data you provide will go directly to them.
Get involved with OpenStreetMaps and contribute data.
Either through #healthmap or directly through their site.
There's a special CrisisCamp on Saturday in Mountain View, getting volunteers together to work on technical projects, including data, maps, and technical assistance to NGOs working in the region.
Well, the title says it all doesn't it?
"Inspired by and started CrisisCamp DC in June, 2009. CrisisCommons is meant to capture knowledge, information, best practices, and tools that support crisis preparedness, prevention, response, and rebuilding"
He's put together a long list of resources and ways to get involved.