The service, already a hit over Live, launches for the today - just in time to cash in on some pre-festive traffic.

Fallout 3, 2, 5, IV, Battlestations Pacific, FUEL, Viva Pinata, Kane and Lynch: Dead Men, Shadowrun, Section 8, Juiced 2 and Red Faction: are on offer at launch.

What's more, Destructoid report that Viva Pinata and Shadowrun are currently available at a discount of fifty percent: 9.99 USD a go.

We'll have more on Games on Demand for Windows Live as we get it.

By Luke Guttridge