Counterstrike 1.6, Source, and a crapload of mods: gildedlink (friends list name, and usually same ingame)
Guild Wars: Balancist Suitengu
Rakion: Pandorus
Mabinogi: gildedlink
Starcraft: gildedlink
Halo: gildedlink
Theres a few more I can't think of atm, but I'll add them later. I'm gonna wait for my DS to recharge before listing those codes.
EDIT: I play Diablo 2 now, only have LOD chars at the moment. Same battle.net account, so same handle. US East as always.