I wouldn't want to go against
WotC's legal team either. It could potentially cause the rest of the conversions to get pulled.
I'm interested in Pathfinder RPG. I can see myself moving totally to 3.5 and importing Pathfinder and 3.0 material as house rules.
So I think it would be great to finish 3.5 and then get Pathfinder RPG stuff started. Ideally, it would be really cool if Creature Catalog had all three stats available for every monster, but I think that might be too much work.
Have you attracted a fan artist yet? It would be great if you could get a collection of OGC fan "portraits" for every monster in the Creature Catalog. If you had them, they could be applied to 3.0, 3.5 or Pathfinder versions of the same monster.
And it would be nice, when the collection of conversions is more complete, to put out compilation PDFs that have a cover, an introduction, a "logical" set or subset of monsters and an index of those monsters as well as any 3.5 monsters that Echohawk has found in official non-OGC sources. (You could, for example put out a "Creature Catalog Converts: Monsters of Maztica" or a "Creature Catalog Converts: Monsters of The Horde" PDF with the conversions you already have. And very soon, you could do a "Creature Catalog Converts: Oozes")
I think that PDFs like that would be something I would be wanting to send over to a Print on Demand (PoD) company and have with my RPG rulebook collection.