This week's list of the top 10 best selling PC games on the Steam service (according to revenue) is full of games that have been on sale. The top two games this week are Valve's 2007 game collection The Orange Box and Relic's RTS game Warhammer 40,000 Dawn of War II Gold Edition, both of which had big temporary price cuts this week.

In fact six of the games in this week's top 10 were put there due to temporary sales. The full list is below:

1. The Orange Box - Valve
2. Warhammer 40,000 Dawn of War II Gold Edition - Relic/THQ
3. Battlefield Bad Company 2 - Digital Illusions/EA
4. Modern Warfare 2 Stimulus Package - Infinity Ward/Activision
5. Tom Clancy's Splinter Cell Elite Echelon Edition - Ubisoft
6. Warhammer 40,000 Dawn of War II Chaos Rising - Relic/THQ
7. Modern Warfare 2 - Infinity Ward/Activision
8. Half-Life 2 - Valve
9. APB All Points Bulletin - Real Time Worlds/EA
10. Killing Floor - Tripwire Interactive