Hack

The second game of the Gothic series continues the third-person RPG goodness. Gothic II was developed by Piranha Bytes. The Night of the Raven expansion is integrated into the original Gothic II game. This expansion adds additional game content and features. Players choose different character specializations which will determine how their character develops. Training points are earned through gaining experience which can be spent to increase character stats or learn new abilities. This game is focused towards hardcore, experienced gamers.

Quake is an FPS from iD Software. You play as a grunt who must travel to a variety of worlds through interdimensional portals and destroy a Lovecraftian horror and hundreds of minions before they can locate and overrun earth. Dark Places is a source port that has various enhancements over the official versions.
It may not be as impressive graphically as say, Tenebrae, but this port is the widescreen king of source ports, so it gets the honors here. Dark Places can be downloaded here (original Quake data is required and not included) http://www.icculus.org/twilight/darkplaces/

Tom Clancy's Ghost Recon Advanced Warfighter 2 (GRAW 2) is the sequel to Tom Clancy's Ghost Recon Advanced Warfighter. It expands on the game play of Ghost Recon Advanced Warfighter and is the fourth installment in the popular Ghost Recon tactical shooter video game series, published by Ubisoft.

Take control of alien wizards as they seek to control manaliths and banish their opponents from the realms. Harvest the souls of your enemies' creatures and create more powerful, deadly beings to ravage the lands. Sacrifice your own followers to destroy your opponent's altar and claim victory. Master the spells given to you by the five gods of this new world: the righteous god of Life, Persephone, the humble god of Earth, James, the all-knowing god of Air, Stratos, the industrious god of Fire, Pyro, and the sinister god of Death, Charnel.

Halo 2 is a Vista only port and sequel to the Xbox hit Halo. Once agian you play as Master Chief and perhaps more later on....

FIFA 07 is a soccer sports simulation game produced in 2006 for the PC

The sequel to Deus Ex. As with most sequels, it didn't live up to the original.

Mafia is a third person action-adventure game in the vein of GTA. The game takes place in a fictional 1930's city.