Alright here we go. These are the best selling PC games in the USA for the entire month February according to NPD. Have a peek:

1. World Of Warcraft: Wrath of the Lich King / Blizzard / $36.55
2. The Sims 2 Double Deluxe / EA Maxis / $19 
3. Warhammer 40K: Dawn of War II / Relic / $38.99
4. World Of Warcraft: Battle Chest / Blizzard / $37 
5. F.E.A.R. 2: Project Origin / Monolith / $44.99  
6. Spore / EA Maxis / $45 
7. World Of Warcraft / Blizzard / $18 
8. The Sims 2 Apartment Life Exp. Pack / EA Maxis / $20 
9. Fallout 3 / Bethesda / $41.70 
10. World Of Warcraft: Burning Crusade Expansion Pack / Blizzard / $28 
11. Call Of Duty: World At War / Treyarch / $42.95 
12. Command & Conquer: Red Alert 3 / EA LA / $27.99
13. Left 4 Dead / Valve / $43.64  
14. The Sims 2 Deluxe / EA Maxis / $3 (Averge)
15. Civilization IV / Firaxis / $21 
16. The Sims 2 Mansion & Garden Stuff Exp. / EA Maxis / $18 
17. StarCraft Battle Chest / Blizzard / $20 
18. Spore Creepy & Cute Parts Pack / EA Maxis / $18 
19. Diablo Battle Chest / Blizzard / $34 
20. The Sims 2 Pets Exp. / EA Maxis / $19