The NPD results are in for the week of December 14th thru December 20th.  Spore and Sims just doesn’t seem to die (which is a good thing)!

1. World of Warcraft: Wrath of the Lich King Expansion Pack
2. Spore
3. Left 4 Dead
4. The Sims 2 Deluxe
5. Call of Duty: World at War
6. Fallout 3
7. The Sims 2 Apartment Life Expansion Pack
8. Bejewled Twist
9. World of Warcraft Battle Chest
10. The Sims 2 Mansion & Garden Stuff Expansion Pack

Source:  IGN