I love to look at reef and fish pictures, so whenever I run across a really good gallery, I'll post it here.
1.
Ramblin' Cameras has six or seven different galleries.
Awesome pics!
http://www.totacc.com/user/wmiller/Rcamindex.htm
2.
ImageQuest 3D
http://www.imagequest3d.com/
3.
Jeff's Nudibranch Site and Coral Reef Gallery
http://www.divegallery.com/ 