I don't have time to blog about the tsunami anniversary myself, but TMV has a good roundup:

It was December 25, 2004 when a 9.15 magnitude earthquake lasting 8 minutes unleashed waves up to 33 feet high — South Asia's Killer Tsunami, a tragedy that would have been even mentally incomprehensible except for the horrific live and video images seen around the world.

As devastating and unexpected as Katrina was, it pales in comparison to the 200,000 people swallowed up by the Indian Ocean tsunami.