So, here's a list of all the tomes in my D&D library (not including novels). I will do some reviews of some of these books in the future, so if you really want my thoughts on one of them, let me know in the comments!
For a grand total of $109, I made the following steal at the Fantasy Shop's Used Gaming Auction.
1981 Basic and Expert D&D Books
B2 Keep on the Borderlands
X1 Isle of Dread
1984 Mentzer Player and DM Companions
AD&D: Fiend Folio, Monster Manual, Monster Manual 2, Oriental Adventures, Dragonlance Adventures,
AD&D 2E: Players Option Skills and Powers, Players Handbook, Complete Thief's Handbook, Complete Book of Humanoids, Arms and Equipment Guide, Players Guide to Dragonlance, Dragonlance Adventure: Dragon Keep, Dragonlance Adventure: Wild Elves, Dragonlance Accessory: Time of the Dragon, Castles Box Set (with fold out castle, wtf?), Fritz Leiber's Lankhmar box
3.x D&D: Players Handbook, DM Guide, Monster Manual (all three for $4!), DM Screen, Pool of Radiance: Attack on Myth Drannor (came with B/X/B2, weird I know),AEG's "Magic", Bastion Press' "Friends and Familiars", Encyclopedia Arcane Crossbreeding and Familiars
Dragon Magazines: 169, 200(!), 233, 302-4, 306-8, 311-15, 351
AD&D 2E Monstrous Compendium Volumes 1 & 2, the binders, including appendices from Kara-Tur, Spelljammer, Outer Planes, Forgotten Realms, Dragonlance, and Greyhawk Adventures
Role Aids Adventures: Wizard's Betrayal and Clockwork Mage
Oh, and Heroes Unlimited and Ninjas & Superspies, because why not?
AD&D (black cover)
Player's Handbook
Dungeon Master Guide
Monstrous Manual
Player's Option: Skills and Powers
Player's Option: Combat and Tactics
Night Below Underdark Campaign
Council of Wyrms Campaign Setting
Dragonlance Modules 1-8 (the teeny-tiny reprints)
Dungeons and Dragons 4th Edition
Player's Handbook
Player's Handbook 2
Player's Handbook 3
Player's Option: Heroes of Shadow
Dungeon Master's Guide
Dungeon Master's Guide 2
Monster Manual
Monster Manual 2
Monster Manual 3
Manual of the Planes
Open Grave: Secrets of the Undead
Tomb of Horrors
Adventurer's Vault
Adventurer's Vault 2
Dragon Magazine Annual 2008
Eberron Campaign Guide
Forgotten Realms Campaign Guide
Vor Rukoth Adventure Setting
Dungeon Master's Screen
Dark Sun Campaign Guide
Dark Sun Creature Catalog
The Shadowfell: Gloomwrought and Beyond
Player's Strategy Guide
4E Essentials
"Red Box" Starter Set
Heroes of the Fallen Lands
Heroes of the Forgotten Kingdoms
Rules Compendium
Monster Vault
Dungeon Tiles Master Sets: Dungeon, City, and Wilderness
Monster Vault: Threats to the Nentir Vale
3E
Dragonlance: Age of Mortals