Will post more tomorrow, now that we're back in the swing of things here. The Global Ideas Bank is now accepting ideas again, so expect a lot of new ideas to go up in the next few days.
In particular, the community have already responded to the tsunami, suggesting ideas to help (and, retrospectively, to prevent): see the Ideas Bank page to see the most recent submissions.
We are also looking to take one suitable idea and bring our resources (by which I mean people and networks) to bear to try and make whatever difference we can. Till then, thoughts are elsewhere.