Where are your non-MM monsters from?

[Testament]

Fiend Folio for the awesome Kaorti and Ethergaunts, and Libris Mortis for all your Undead needs.

BoVD gets some use as well, although most of the time it's the good old MM.

 

[Ibram]

Conan d20
Manual of Monsters (the Warcraft d20 monster book)
my own sick mind

 

[Olgar Shiverstone]

Setting-specific: Monsters of Faerun and the other FR supplements (Underdark and CotSQ, lately).

 

[wingsandsword]

The vast majority of my encounters are from the MM, a small number come from MMII, and Monsters of Faerun.

 

[arwink]

Setting specific sources, monsters of Faerun (not counter previously because I don't run the realms), Dragon, The Book of Fiends, and a hell of a lot of Homebrew

 

[Greylock]

...especially with the party fighter riding around on a Shard Droth'yar.

Oh my goodness, and I almost let a game day pass without saying thanks. Thanks, Mark, the critter rocks. And from what I've seen, so does the rest of that Avadnu book. I really should get in on your end of the game someday. You get to play with the really good stuff. ;p

 

[BOZ]

others have mentioned it (thanks! ) but no one gave a link: http://www.enworld.org/cc/index.php

 

[Wombat]

I use a few critters out of Creature Collection I & II, as well as from sources like Nyambe, Skull & Bones, and Hollowfaust, but most of the "extra creatures" are setting-specific homebrews and/or NPCs.

 

[Andrew D. Gable]

Both ToH.

 

[Dark Jezter]

Since I'm running an FR campaign, most of our non-MM monsters come from Monsters of Faerun.

And when I get a chance to run Warcraft sessions, I use monsters from the Manual of Monsters.