All of Monster Manual II is now in. Sources completed are :
Deities & Demigods - WOTC
Dragon #297 - Paizo Publishing
Dragon #300 - Paizo Publishing
Dragon #301 - Paizo Publishing
FRCS (Forgotten Realm Campaign Sourcebook) - WOTC
Monster Manual - WOTC
Monster Manual II - WOTC (thanks to Meepo)
MotW (Masters of the Wold) - WOTC
Psionics Handbook - WOTC
Shaman's Handbook - Green Ronin
Sources I have but not done yet are :
The Adventure Path monsters (except for a few variant golems and those in MMI)
If thoughts could kill/Of sound Mind/Psionics Toolkit
Return to the Temple of Elemental Evil
Mongoose's Battle Magic, Demonology WE, Seas of Blood and Skraag
Book of Challenges (yep, a single monster inside)
Defenders of Faith
Various Dragon and Dungeon Magazins
Epic Level Handbook
FFGs Path of the Sword, Seafarer's Handbook and Traps and Treachery
Green Ronin's Legion of Hell
Various monsters from the WotC site features
Kenzer&Ko's Harvest of Darkness and Kingdoms of Kalamar
AEG's Creatures of Rokugan and Rokugan
Magic of Faerun
Malhavoc's Book of Eldritch Might 1&2
Manual of the Planes
Monsters of Faerun
Oriental Adventures
Penumbra's Touched by the Gods
Arthaus' Denizens of Darkness (and WE), Ravenloft and van Richten's Arsenal
Silver Marches
Sword & Sorcery's Burok Torn, Divine & Defeated, Vigil Watch, Creature Collection I+II and Relics & Rituals
Tome & Blood (could have dropped that one, though)
Web Enhancements for MotP, PsiHB and MMII
Phoenix_Knightwind, start wherever you want, check the list above first. Posting here is fine, I don't have an excel reader.