Darkness said:
"Yet another case?" Oh - I didn't know that there were others... Do you know which ones, BTW?
Okay, we digress from the topic of yeti, but off the top of my head:
Quite a few of the demon princes and devil lords were in the
Book of Vile Darkness.
The stirge devil and the groaning spirit are just the chasme (BoVD) and banshee (MM2, albeit a lot more powerful since 1st edition) with the serial numbers filed off. Similarly, I don't see how the stegocentipede is really different from the array of different-sized monstrous centipedes we already have, except in name.
Tsathoggua has been done in
Call of Cthulhu d20 (a technicality, I admit, but a previously-published WotC d20 product nonetheless).
The aurumvorax and lurker above are both in WotC's "Monster Mayhem" feature (in fact, the aurumvorax was one of the first monsters to appear there, back in 2000). Yeah, I know it will seem harsh of me to some to count WotC's website as a publication, but it is.
The huecuva and ice golem have both been in DUNGEON magazine, but are different enough that I'm inclined not to be as worried there (though some note of the different huecuva would have been nice, and I sure as heck don't need two ice golems).
Several of the monsters are represented by templates in 3e, and having different versions that are inconsistent with those templates does not make the situation better in my opinion (though WotC themselves have been guilty of this with several variant half-fiends such as the Durzagon, Fey'ri, and Tannaruk). In this category are the dracolisk, forlarren, and (as I recall) cambion and alu-demon. At the very least I want explanations for
why these cases should be different from all other half-breeds. The fact that they
were different in editions before the templates existed counts for nothing to me. Oh, add the gorgimera, given the chimeric template in the MM2.
To me that adds up to a fair amount of wasted space. I honestly would have been happier with a book that didn't include most or all of the creatures above. I also thought that some of the incorporeal undead would have been better done by simply introducing new powers for ghosts (now that there's so much more variety already expressible via ghosts), but I can concede that as a matter of taste.