Wrath of the Lich King, last year's expansion to Blizzard's all-conquering MMO World of Warcraft, has spent another week at the top of the US PC chart, according to NPD sales data for the week ending May 2.

The Sims 2: Double Deluxe was second, ahead of Left 4 Dead in third and the WoW Battle Chest in fourth.

SEGA's Empire: Total War took fifth place ahead of the original WoW box, while the Fallout Trilogy compilation took seventh.

DemiGod, The Sims 2: Apartment Life and Spore rounded out the top ten list, which is as follows:

1. World of Warcraft: Wrath of the Lich King
2. The Sims 2: Double Deluxe
3. Left 4 Dead
4. World of Warcraft: Battle Chest
5. Empire: Total War
6. World of Warcraft
7. Fallout Trilogy
8. DemiGod
9. The Sims 2: Apartment Life
10. Spore