Oh...this is what I own. Most of it hasn't been played since the early 1990s at the latest, with a few exceptions - Arkham Horror, Axis & Allies and some other military games and the occasional game of Magic.

Board Games and Non-Collectible Card Games

Advanced Civilization (Avalon Hill title unrelated to computer game)
The American Civil War
Arkham Horror
Arkham Horror: The Black Goat of the Woods
Arkham Horror: Curse of the Dark Pharaoh
Arkham Horror: The Dunwich Horror
Arkham Horror: The Innsmouth Horror (on order, not yet released)
Arkham Horror: The King in Yellow
Arkham Horror: The Kingsport Horror
Axis & Allies (original and 2004 revised editions)
Axis & Allies Anniversary Edition
Axis & Allies: Battle of the Bulge
Axis & Allies: D-Day
Axis & Allies: Europe
Axis & Allies: Guadalcanal
Axis & Allies: Pacific
Backgammon
Battle Cry
The Battle of the Bulge
Battle of the Sexes
Boggle
Broadsides and Boarding Parties (at parents’ house)
Checkers (only one set, surprisingly)
Chess (at least four sets, I’m sure I have a few more in boxes)
Civilization the Boardgame (Eagle Games based on computer game of same name)
Class Struggle
Clue
Conquest of the Empire (original Gamemaster and new Eagle Games versions)
Crusader Rex
Diplomacy: Original Game
Diplomacy: Deluxe Diplomacy
Diplomacy: Colonial Diplomacy
Electronic Battleship
Empires in Arms
Facts in Five (terrible Avalon Hill version of Trivial Pursuit)
Feudal
Fortress America (at parents’ house)
Front Series: East Front
Front Series: Euro Front
Front Series: West Front
Harry Potter – the Quidditch Game
Jenga
Labyrinth
Liberty: the American Revolution
Life
Mah Jongg (two sets, one bought in Hong Kong, other at Bombay Company)
Mhing (a card game based on Mah Jongg)
Mastermind
Monopoly
Mousetrap
Napoleon
Napoleon in Europe
Nuclear War
Operation
Panzerarmee Afrika
Parcheesi
Past Lives
Payday
Pente
Poker Sets (three)
The Rise and Decline of the Third Reich
Risk – Commemorative Edition (Reprint of 1959 Original)
Risk – New Version
Scrabble
Senet: Game of Ancient Egypt
Settlers of Catan
Settlers of Catan: Cities and Knights
Settlers of Catan: Traders and Barbarians
Sho: An Ancient Tibetan Dice Game
Shōgun (later renamed Samurai Swords; I have the original version)
Sorry!
Stratego (Nostalgia version)
Supremacy
Survive
Tikal
Trivial Pursuit: 30th Anniversary Edition
Trivial Pursuit: 80s Edition
Trivial Pursuit: Star Wars Edition
Uno
Victory in the Pacific
Vietnam
Wadjet
War of the Ring
War of the Ring: Battles of the Third Age expansion
War on Terror
Whodonit
Wizard’s Quest

Collectible Card Games
Magic (nothing earlier than Unlimited, virtually nothing later than Mercadian Masques)
Mythos (complete set as the game is discontinued)
The Wheel of Time CCG (complete set as the game is discontinued)
Legend of the Five Rings (nothing earlier than Black Scrolls, nothing later than 1999)

Miniatures Games
Axis & Allies Miniatures (full set)
Axis & Allies Naval Miniatures (War at Sea) (full set)

Roleplaying Games
Dungeons & Dragons Basic Set (circa 1982)
Dungeons & Dragons Expert Set (circa 1984)
Dungeons & Dragons Master Set (circa 1986)
Dungeons & Dragons Rules Cyclopedia (compilation of all sets)
Advanced Dungeons & Dragons First Edition
* Player's Handbook
* Dungeon Master's Guide
* Monster Manual
* Monster Manual II
* Fiend Folio
* Deities & Demigods (first edition w/ Cthulhu Mythos)
* Legends & Lore
* Unearthed Arcana
* Oriental Adventures
* Dungeoneer's Survival Guide
* Wilderness Survival Guide
* Manual of the Planes
* Dragonlance Adventures
* Greyhawk Adventures
* World of Greyhawk Campaign Setting
* Forgotten Realms Campaign Setting
* World of Kara-Tur Campaign Setting
* Battlesystem Boxed Set
* virtually every First Edition module produced (A1-4, B1-9, C1-3, CM1-3, D1-3, DL1-16, EX1-2, FR1-5, FRE1-3, G1-3, I1-6, I10, L1, N1, N5, O1-2, Q1, S1-4, UK1, X1-2, X4-5, special reprint deluxe versions A1-4, GDQ1-7, I3-5, T1-4, B1-9)
* Book of Lairs, Book of Lairs II, other similar books
* Lots of issues of Dragon magazine
Advanced Dungeons & Dragons Second Edition
* Player's Handbook
* Dungeon Master's Guide
* Monstrous Compendium (all expansions)
* Monstrous Manual
* Legends & Lore
* Tome of Magic
* Dark Sun - Dragon Kings
* Forgotten Realms Adventures
* Complete Fighter's Handbook
* Complete Thief's Handbook
* Complete Priest's Handbook
* Complete Wizard's Handbook
* Complete Psionics Handbook
* Complete Humanoid's Handbook
* Castle Guide
* Dungeon & Catacomb Guide
* Draconomicon
* Drow of the Underdark
* Battlesystem Revised Rules
* Boxed Sets: Ravenloft, Spelljammer, Dark Sun, Dragonlance - Time of the Dragon, Menzobarranzan, Revised Ravenloft, Greyhawk - Out of the Ashes, City of Greyhawk, Planescape, Planescape: Blood War, Ruins of Undermountain, Ruins of Undermountain II, Al Qadim (together with core book for same)
* Non-approved expansions like City-State of the Invincible Overlord (by Gary Gyga and expansions thereto
The Palladium Roleplaying Game (along with Book II: The Old Ones)
Palladium's Beyond the Supernatural
Palladium's Teenage Mutant Ninja Turtles (with Crossdimensional expansion book)
Palladium's Empires of the Nile roleplaying system
Marvel Superheroes Roleplaying (and advanced expansion, with about 12 modules/expansions)
Paranoia
Car Wars
Top Secret (along with advanced version)
Gamma World (Revised Edition)
Middle Earth Roleplaying (along with almost all modules and expansions, which are too numerous to list after all that I've already listed)
Rolemaster
Warhammer Roleplaying
In Nomine (along with the first three expansion books)
GURPS Roleplaying
Cyberpunk
Ghostbusters
Call of Cthulhu (third edition, fifth edition and TSR version, includes lots of modules for fifth edition)
Shadowrun
Doctor Who
Star Trek (along with Star Trek IV expansion book)
Star Wars (along with several modules and expansion books)

I know I'm forgetting something here...