There are now a lot of websites out there that have before and after pics.
You can check out DigitalGlobe or Corey Koberg. Corey’s has pictures of the tsunami in action, which I personally find disturbing. Seeing pictures of people being swallowed up in the tsunami and are likely now dead doesn’t really appeal to me. But if you want to check it out, that’s up to you.
Here’s another one that’s quite good. It shows the before and after of Banda Aceh Shore in Indonesia. Good in the sense that it very clearly shows the damage. Not good in that it can be upsetting to see.