So Left 4 Dead 2 is at the top of this week's Steam top 10 best selling game list. Not a shock. Not a shock at all, considering that the zombie co-op shooter sequel from Valve won't be showing up on any other downloadable game services. With the demo (for pre-orders) being released next week on Steam you can bet that sales will continue to pick up . . . oh you get it.

Borderlands continues to do well in its pre-orders, showing up in the number two position. Codemasters' military shooter Operation Flashpoint: Dragon Rising is also still selling well and is in the number three position this week.

1. Left 4 Dead 2 - Valve
2. Borderlands - Gearbox Software/2K Games
3. Operation Flashpoint: Dragon Rising - Codemasters
4. Civilization IV: The Complete Edition - Firaxis/2K Games
5. Aion Standard Edition - NCSoft
6. Warhammer 40,000 Dawn of War II - Relic/THQ
7. Saints Row 2 - Volition/THQ
8. Cities XL Limited Edition - Monte Cristo Games
9. Left 4 Dead - Valve
10. Counter-Strike: Source - Valve