I've been working on redesigning Wetpixel.com for the past couple of weeks, and it's finally live! (the new DNS is still propagating, so you may see the old one for another day or so) I'm using Greymatter there, too. I love Greymatter. I was going to try to use PHPNuke, but the introductory stages of implementation took place on Readyhosting's servers. Blech. We're now at CWIHosting, which kicks ass.
Anyway, so if you're into underwater digital photography, check out Wetpixel.com. :)