From sharazad:

Boldface if "I own this game".
Italics is "I have played this game".
Italic and Bold are "I both own and have played this game"

Acquire
Amber Diceless
Amun-Re
Ars Magica
Axis & Allies
Battle Cry
BattleTech
Blood Bowl
Bohnanza
Britannia
Button Men
Call of Cthulhu
Carcassonne
Car Wars
Champions
Circus Maximus
Citadels
Civilization
Cosmic Encounter
Cosmic Wimpout
Dawn Patrol
Descent
Diplomacy
Dungeons & Dragons (used to own it, but not any more)
Dynasty League Baseball
El Grande (played half a game once. After seeing the reviews this gets, I think I need to drag it out and give it another try...)
Empires in Arms
Empires of the Middle Ages
The Extraordinary Adventures of Baron Munchausen
Fire and Fury
Flames of War
Fluxx
Formula Dé
The Fury of Dracula
A Game of Thrones
Gettysburg
Ghostbusters
The Great Khan Game
Hammer of the Scots
Here I Stand
A House Divided
Illuminati
Johnny Reb
Junta
Kingmaker
Kremlin
Legend of the Five Rings CCG
Lensman
London's Burning
Lord of the Rings
Machiavelli
Magic: The Gathering
Marvel Super Heroes
Metamorphosis Alpha
My Life with Master
Mythos
Napoleon's Last Battles
Naval War
Ogre
Once Upon a Time
PanzerBlitz
Paranoia
Pendragon
Pirate's Cove
Plague!
Power Grid
Puerto Rico
Renaissance of Infantry
RoboRally
RuneQuest
The Settlers of Catan
Shadowfist
Shadowrun
Shadows over Camelot
Silent Death: The Next Millennium
Space Hulk
Squad Leader
Stalingrad
Star Fleet Battles
The Sword and the Flame
Tales of the Arabian Nights
Talisman
Thurn and Taxis
Ticket to Ride
Tigris & Euphrates
Tikal
Toon
Traveller
Twilight Struggle
Unknown Armies
Up Front
Vampire: The Eternal Struggle
Vampire: The Masquerade
Vinci
War and Peace
Warhammer 40,000
The Warlock of Firetop Mountain
The Warlord
Wiz-War

*looks back over the list*

Hmm, that's pretty damned sad. Anybody in Central Maine want to help me italicize a few more?

(edit: fixed bad /b tag)