Gamasutra, referring to data of NPD, released a list of best-selling games 2008. Of course, the year is not over yet, but now you can see what games are most popular with users.
Best-selling Xbox 360 games:
Grand Theft Auto 4 (Rockstar Games);
Call of Duty 4 (Infinity Ward);
Madden NFL 09 (EA Tiburon);
Rainbow Six Vegas 2 (Ubisoft Montreal);
Army of Two (EA Montreal).
Best-selling PlayStation 3 games:
Grand Theft Auto 4 (Rockstar Games);
Metal Gear Solid 4: Guns of the Patriots (Kojima Productions);
Call of Duty 4 (Infinity Ward);
Madden NFL 09 (EA Tiburon);
Gran Turismo 5 Prologue (Polyphony Digital);
Best-selling Nintendo Wii games:
Super Smash Bros. Brawl (Nintendo);
Mario Kart Wii (Nintendo);
Wii Play (Nintendo);
Wii Fit (Nintendo);
Guitar Hero 3: Legends of Rock (Vicarious Visions).