Requiring an update to version 3.2 of the Games for Windows Live client, Games on Demand sells digital downloads of GFW titles by credit card or with Microsoft Points.

A free version of Tinker--a puzzler previously released for Windows Vista Ultimate--and 50% discounts on Shadowrun and Viva Pinata are on hand to celebrate the launch.

The launch titles and their US and UK prices follow below. The previously-announced GFWL-enabled versions of Osmos and World and Goo are absent from the lineup, while Kane & Lynch curiously can only be bought with Microsoft Points.

• Fallout 3 - $49.99 / £34.99
• Resident Evil 5 - $49.99 / £29.99
• DiRT 2 - $39.99 / £34.99
• Street Fighter IV - $39.99 / £24.99
• Red Faction: Guerrilla - $39.99 / unavailable in UK
• Battlestations: Pacific - $34.99 / £24.99
• Kane & Lynch: Dead Men - 1600 Microsoft Points ($20 / £13.60)
• Viva Pinata - $9.99 / £7.49 (50% off)
• FUEL - $39.99 / £34.99
• Shadowrun - $9.99 / £7.49 (50% off)
• Section 8 - $49.99 / £29.99
• Juiced 2: Hot Import Nights - $19.99 / £14.99
• Tinker - Free