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Here are the top-selling games for the week on Steam:

1. Left 4 Dead 2.
2. Borderlands and Dragon Age: Origins.
3. Operation Flashpoint: Dragon Rising.
4. Dragon Age: Origins Digital Deluxe Edition and Civilization IV: The Complete Edition.
5. Aion Standard Edition.
6. Warhammer 40,000: Dawn of War II.
7. Saints Row 2.
8. Cities XL Limited Edition.
9. Left 4 Dead.
10. Counter-Strike: Source.