You know, I was thinking about that. Next on my list of things to do is to sort through all of those games and rule out which ones don't have any multiplayer aspect. That should get done in the next day or two... maybe... don't hold your breath. We are getting ready to do an arctic training exercise.
Just downloaded Dungeon Defenders to play with some friends. It's awesome if you guys haven't tried it. The demo allows multiplayer. I should probably also list the other two games I forgot about last time. Dead Nation, and Little Big Planet.
Well... I recently went and entered my entire game collection into a spreadsheet. It's on Google Docs. If you wanna see for yourselves, here's a link.
Or... if you prefer a PS3/PSN-only list... I think these are all the ones that have multiplayer components.
BlazBlue: Continuum Shift Extend
Call of Duty 4: Modern Warfare
Far Cry 2
Fatal Inertia EX
King of Fighters XIII
Marvel vs. Capcom 3: Fate of Two Worlds
Mortal Kombat vs. DC Universe
Ultimate Marvel vs. Capcom 3
Unreal Tournament III
DC Universe Online
Elemental Monster Online Card Game
Lead and Gold: Gangs of the Wild West
Magic: The Gathering - Duels of the Planeswalkers
Mahjong Tales: Ancient Wisdom
Marvel vs Capcom 2
Mortal Kombat II
Plants vs. Zombies
Scott Pilgrim vs. The World
Street Fighter III: Third Strike Online Edition
Super Puzzle Fighter II Turbo HD Remix
Super Street Fighter II Turbo HD Remix
Swords and Soldiers