Weekly PC Sales Charts No Longer Provided by NPD, Steam and Direct2Drive Continue

Research firm The NPD Group will no longer release its weekly charts of the ten best-selling PC games at United States retailers to the media, the company has confirmed with Shacknews. It will still issue monthly PC sales charts to the public, though, with the entirety of the sales data, as always, available to NPD's paying clients.

No reason was given for the switch, though we've asked for more details. Back in 2007, the company opted to stop publicly releasing its monthly sales figures and listings for consoles, though it quickly reversed that decision following public outcry.

However, PC digital distribution outlets Steam and Direct2Drive continue to release their weekly worldwide sales charts. And with NPD's week-long delay of its retail sales data no longer presenting an obstacle for per-week comparisons with Steam and Direct2Drive's data, the digital distribution charts will now be posted in a more timely manner.

As such, the past two week's worth of Direct2Drive and Steam charts follow:

Direct2Drive's Top Ten (6/7 - 6/13)

1. The Sims 3 - Electronic Arts

2. The Sims 3 (Mac) - Electronic Arts

3. Prototype - Radical

4. Civilization 4: Complete Edition - Firaxis

5. The Sims 3 w/Prima Guide - Electronic Arts

6. DCS: Black Shark - The Fighter Collection

7. Fallout 3 - Bethesda

8. Call of Duty 4: Modern Warfare - Infinity Ward

9. Mass Effect - BioWare / Demiurge

10. Civilization 4 - Firaxis

Steam Top Ten (By Revenue) (6/7 - 6/13)

1. Prototype - Radical

2. Left 4 Dead - Valve

3. Killing Floor - Tripwire

4. Team Fortress 2 - Valve

5. Counter-Strike: Source - Valve

6. The Orange Box - Valve

7. Call of Duty 4: Modern Warfare - Infinity Ward

8. Penumbra Collector Pack - Frictional Games

9. RailWorks - RailSimulator.com

10. Plants vs. Zombies - PopCap

Direct2Drive's Top Ten (6/14 - 6/20)

1. The Sims 3 - Electronic Arts

2. The Sims 3 (Mac) - Electronic Arts

3. Ghostbusters: The Video Game - Terminal Reality

4. Prototype - Radical

5. Civilization 4: Complete Edition - Firaxis

6. Fallout 3 - Bethesda

7. Aion: The Tower of Eternity (Pre-Order) - NCsoft

8. Call of Duty 4: Modern Warfare - Infinity Ward

9. Mass Effect - BioWare / Demiurge

10. Call of Duty: World at War - Treyarch

Steam Top Ten (By Revenue) (6/14 - 6/20)

1. Prototype - Radical

2. Empire: Total War - Creative Assembly

3. Left 4 Dead - Valve

4. Ghostbusters: The Video Game - Terminal Reality

5. The Elder Scrolls Game of the Year Pack Deluxe - Bethesda

6. Counter-Strike: Source - Valve

7. Team Fortress 2 - Valve

8. Killing Floor - Tripwire

9. The Elder Scrolls IV: Oblivion Game of the Year Edition Deluxe - Bethesda

10. The Orange Box - Valve