Here's an overview of the NPD chart's detailing the best selling PC games in the USA for the week ending March 15.
1. The Sims: FreeTime - Electronic Arts
2. Warhammer 40,000: Dawn Of War Soulstorm - THQ
3. Call Of Duty 4: Modern Warfare - Activision
4. Sins Of A Solar Empire - Ironclad Games/Stardock
5. The Sims 2 Deluxe - Electronic Arts
6. World Of Warcraft - Blizzard
7. World Of Warcraft: Battle Chest - Blizzard
8. World Of Warcraft: Burning Crusade - Blizzard
9. Frontlines: Fuel of War - THQ
10. Sim City 5: Societies - Electronic Arts