Wasn't there an online document with a whole mess of converted monsters from previous D&D editions? I thought it was somewhere on this site but I can't find it. Anyone got a link?
If you like the Creature Catalog conversion a lot I highly suggest that you pick up Tome of Horrors from Necromancer Games. It contains a major selection of old 1st Edition monsters that have been updated for 3rd Edition rules. The book was penned by Scott Greene and Clark Peterson.
Thanks EricNoah! I'm doing a quick and dirty conversion of the Original Ravenloft Module. If anyone would like to help me out further I would appreciat it!