Weekly PC Sales: Left 4 Dead, MMOs Stay on Top

If this week's breakdown of the best-selling titles from digital distribution outlets Steam and Direct2Drive looks a bit familiar, that's probably because you saw last week's list.

Sure, there are some subtle differences--the THQ Collector Pack and Call of Duty 4 weren't on last week's Steam list, CoD: World at War and The Witcher are new to this week's Direct2Drive chart--but mostly, it's the same stuff in a slightly different order.

That said, things are bound to change soon. With Champions Online launching in North America and Europe this week, pre-orders for the MMO probably won't top Direct2Drive's chart much longer, and with Aion and Fallen Earth also launching here in the next few weeks, it'll be interesting to see how September's MMO trio performs post-release.

Steam's Top Ten (by Revenue) (8/23 - 8/29)

1. Left 4 Dead / Valve

2. Aion Collector's Edition (pre-order) / NCsoft

3. THQ Collector Pack

4. Counter-Strike: Source / Valve

5. Killing Floor / Tripwire

6. Team Fortress 2 / Valve

7. The Orange Box / Valve

8. Fallout Collection (F1, F2, Fallout Tactics)

9. Call of Duty 4: Modern Warfare / Infinity Ward

10. Valve Complete Pack / Valve

Direct2Drive's Top Ten (8/23 - 8/29)

1. Champions Online (pre-order) / Cryptic

2. Fallen Earth (pre-order) / Fallen Earth, Icarus Studios

3. Aion Collector's Edition (pre-order) / NCSoft

4. Rise of Flight / neoqb

5. Fallout 3 / Bethesda Softworks

6. Hearts of Iron III / Paradox Interactive

7. Civilization 4: The Complete Edition / Firaxis

8. Call of Duty: World at War / Treyarch

9. The Sims 3 / The Sims Studio

10. The Witcher: Enhanced Edition - Director's Cut / CD Projekt RED