That's too bad to hear about the site going down. It's never good for the community to lose a good resource like that. Does anyone know how to get in contact with the owner of that site? Maybe there's some chance we can merge his information into the Galleries here?
abeam, I'm assuming you are aware of the features of this site. In case you are not, this might help you find the information you are looking for:
1. You can always browse the Checklists by Toy Series:http://www.figurerealm.com/BrowseFiguresChk.php
2. Or by other options such as manufacturer:http://www.figurerealm.com/BrowseFiguresChk.php
3. The universes exist for some of the major universes, like Marvel and DC:http://www.figurerealm.com/viewcharacterprofile.php?universeID=2&universe=dc
4. Clicking on a Character will give you a list of every figure produced:http://www.figurerealm.com/viewcharacterprofile.php?profileID=315&character=aquaman
Hopefully there's something in there that will help. If not, why?