Once again speaking to the strength of exclusive offerings, digital distributors Steam, Direct2Drive and Impulse have unveiled sales charts from the week of February 21.

Due to the strong performance of Steam and Impulse's various exclusive games, there's no clear winner, so to speak--every outlet has an entirely different top five, with BioShock 2 and Mass Effect 2 marking the only two titles to appear on more than one list.

Update: There is a clear winner after all--in the form of Battlefield: Bad Company 2--one that was temporarily obscured as Steam seemingly removes pre-orders from its "Weekly Top Sellers" RSS after a game is released, as BFBC2 and SupCom 2 were this Tuesday. Thankfully, Blue's News archived the initial listing on Monday.

Steam (By Revenue) - February 21 through February 27, 2010
1. Battlefield: Bad Company 2 LE (Pre-Order) - DICE
2. *Supreme Commander 2 - Gas Powered Games
3. *Call of Duty: Modern Warfare 2 - Infinity Ward
4. *Napoleon: Total War Imperial Edition - Creative Assembly
5. *Aliens vs. Predator - Rebellion
6. *Napoleon: Total War - Creative Assembly
7. Assassin's Creed 2 (Pre-Order) - Ubisoft Montreal
8. SpellForce 2: Gold Edition - Phenomic
9. Dawn of War II - Chaos Rising (Pre-Order) - Relic
10. BioShock 2 - 2K Marin, Digital Extremes
11. *Left 4 Dead 2 - Valve
12. Mass Effect 2 - BioWare

Direct2Drive - February 21 through February 27, 2010
1. Battlefield: Bad Company 2 LE (Pre-Order) - EA DICE
2. Star Trek Online Digital Deluxe Edition - Cryptic
3. BioShock 1 + 2 Bundle - 2K Games
4. Star Trek Online - Cryptic
5. Dragon Age: Origins + Awakening Pre-Order Bundle - BioWare
6. Civilization 4 Complete - Firaxis
7. Aion - NCSoft
8. Mass Effect 2 Digital Deluxe Edition - BioWare
9. BioShock 2 - 2K Marin, Digital Extremes
10. Mass Effect 2 - BioWare

Impulse - February 21 through February 27, 2010
1. *Sins of a Solar Empire Trinity Pack - Ironclad
2. *Sins of a Solar Empire: Diplomacy - Ironclad
3. *Sins of a Solar Empire Expansion Bundle - Ironclad
4. Dawn of Discovery Gold - Blue Byte
5. Mount & Blade - Taleworlds
6. *GalCiv II: Ultimate Edition - Stardock
7. *Sins of a Solar Empire: Entrenchment - Ironclad
8. Ecochron Legends - StarWrath3D
9. Eufloria - Omni-Labs
10. Supreme Commander Gold - Gas Powered Games