The thread on RC is OK. The pictures are pretty sharp but on some I was not sure what I was supposed to be looking at. It is hard to take good pictures in an aquarium and it is always easier to make an ID from a good image.
I really like
Melev's Reef - Visual Identification for ID's because the pictures are good quality and specific. The other thing I like is having a resource to refer people to. A thread will get buried and the information will be lost, websites are more enduring.