Diablo II
Gothic
Mass Effect 1&2
Fallout 3&New Vegas
Oblivion
Dungeon Siege 1&2
Sacred
Spellforce
The Witcher 1, playing right now.. after that
The Witcher 2
Dragon Age
And thanks to gog.com planned for this year:
Baldurs Gate 1&2
Fallout 1&2
Icewind Dale 1&2
Gothic...