Gary, I don't see a website being great help unless you have an inkling, I mean take this POTW for example.
You have a picture you have taken. You think it's a soft coral, so it goes into your soft coral folder on your hard drive.
Maybe one day you want to figure out what sort of Soft Coral it is, so you go to a website to work it out, this website has everything ever found underwater on it, all with photos and Scientific Names and Common Names, Habitats, Geography, Size etc etc.
So you go to the soft coral section and start browsing photos. I don't know how many soft corals there are, but I imagine there are thousands. Are you going to go through all the photos checking to figure out which coral is yours? What happens when you have gone throgh the photos (all 3000 of them) and you couldn't find it? Could be because you missed it, could because it's actually in a different section under anenomes or something like that ... how would you ever find it unless you already knew just a little something about the thing you had taken a photo of?
I don't know how you could ever go abouts it online, I mean even the books aren't perfect .. if you know nothing it's impossible to find anything easily.
I guess this is why eric is always harping on .. Title your Critter Identification Topics better so that it is a little helpfull to others.
I guess scientific types would know better about how to go about this project, although they normally start of all the dividing down to smaller groups by scientific names, and not many of us know what they mean, I know I don't
Maybe some sort of photo recognition might work ? like they use on the myheritage.com to match you with a bunch of celebritys you look like?
I think I ranted enough, but it would be a cool resource to have online, I mean you could just have a system that worked and it could encompass everything .. birds, fish, corals, plants, reptiles, mammals etc etc