Database of On-line games

[Yutz]

List games by system you have that are playable online with at least one other person. Don't bother with friend codes, that can be exchanged elseware like on IRC. HERE ARE MINE.

Wii:
Guitar Hero 3
Guitar Hero World Tour
Sin & Punishment 2
SSB: Brawl

Nintendo DS:
(My DS can't connect to the net, listing this is currently just a formality)
Pokemon Pearl
Arkanoid DS
FFCC: Echoes of Time

[Deck]

Wii:
Monster Hunter Tri

PC:
Borderlands
City of Heroes (No Going Rogue)
Dead Rising 2
Garry's Mod
Team Fortress 2
Half-Life 2: Deathmatch
Left 4 Dead 2
Iron Grip: Warlord
Minecraft
Monday Night Combat
Neverwinter Nights
Portal 2
Sanctum
Serious Sam HD: 1 and 2
Spiral Knights
Swords and Soldiers
Terraria
Worms Reloaded
Warhammer Online
World of Warcraft (No Cataclysm)

Considering Purchase: (Online Games Only)
City of Heroes: Going Rogue (PC) or DCU Online??? (PC)
Diablo 3 (PC)
FFCC: Echoes of Time (DS - If you're interested in picking it up again)

[Boris]

I only play these regularly:
WoW: Cataclysm
Starcraft 2

but I do in fact have:
TF2
L4D/2
Gmod
Borderlands
Civ 4 and 5
Bad Company 2
Rise of Legends
Minecraft
Titan Quest
Sword of the Stars and all expansions

and maybe others, I dunno, I have Dawn of War up through dark crusade, but not installed.

Also, I have a CoH (not going rogue) account and an EvE account, but both are currently inactive.

I DO NOT have a Wii anymore, my brother got that when he moved. All the above are PC games.

[Buzzard]

Online vidya?

NDS: NOTHING BECAUSE THE DS HATES WIFI
Pokemon Diamond
Pokemon Heart Gold
Castelvania: Portrait of Ruin

Wii:
Monster Hunter Tri
Brawl

PC:
L4D/2
Garry's Mod
Bad Company 2
TF2
Starcraft 1&2
Borderlands
Minecraft
Alien vs Predator
Worms Reloaded
Supreme Commander 2
Team Fortress Classic
Unreal Tournament
Unreal Tournament 2004
Unreal Tournament 3
Starwars Battlefront 2
Lead & Gold
Red Faction: Guerrilla
Plain Sight
Moonbase Alpha
Killing Floor
Gunbound
Frontlines: Fuel of War
Counter Strike: Source
Battlefield 2

[Doctor Worm]

DS:
Nothing, get out.

Wii:
Super Smash Brothers Brawl
Tatsunoko vs. Capcom: Ultimate All-Stars

PC:
Team Fortress 2
Worms Reloaded
Audiosurf
Counter-Strike
DC Universe Online
Deathmatch Classic
Half-Life 2: Deathmatch
Killing Floor
Left 4 Dead
Left 4 Dead 2
Magic: The Gathering: Duel of the Planeswalkers
Sid Meier's Civilization IV
Team Fortress Classic

[Deck]

List of Free Steam Games that may or may not be Multi-Player:

http://forums.steampowered.com/forums/showthread.php?t=851573

[MDude]

Oh hey, I finally realized this thread exists.

Wii:
Super Smash Brother Brawl

Playstation 3:
Little Big Planet 1 & 2

Wii U:
Sonic All-Star Racing

PC:
Team Fortress 2
Portal 2
Minecraft

Probably some others that I'll add as I remember them.