I suspect a lot of them are simply advanced versions of existing monsters (I doubt Dark Queen of Krynn's "Huge Crocodile" is anything more than an advanced Giant Crocodile), or creatures that have official 3E stats (e.g. the "Sand Howler" is in Dungeon #110).
Still, there are a few left that seem to be variants or maybe even new monsters, like the Guard Yeti or White Gorgimera.
There are also a bunch of creatures on the Official D&D Video Game Index that aren't on the Printed Stats list which presumably only have "video game" stats.
Interested readers might like to view the What Conversions Shall We Do Next? thread I recently started to brainstorm what monsters to do once we get a few of our current con.
If we can actually knock off another epic threat or two, that list is almost done! And I'd actually support saving the titan for later in order to include the gila monster with the lizard lord....
To speed up progress, we might try decreasing the number of active threads (some more). I don't see work letting up a lot any time soon.