The Games on Demand side of the Games for Windows Live client won't roll out until December 15, but it'll launch with a handful of games, including Resident Evil 5, Red Faction: Guerrilla, Battlestations: Pacific, and new GFWL-enabled versions of World of Goo and Osmos. A free game--a GFWL-enabled version of Tinker--will also be offered. The process sounds an awful lot like the on-demand offerings that were recently added to the Xbox 360, with payment options that include straight-up credit card purchases as well as Microsoft Points transactions, and the ability to redownload anything at any time.
Not a bad idea, really, but with the GFWL client acting more like a simple storefront and less like a social network, they're still missing the key part of what makes Steam work so well. Every time you log into Steam to see what your friends are doing, you're hit over the head with new releases and HOT DEALZ. It's like they're daring you to get to the community tab without at least clicking through to one or two store pages. I don't know about you, but I usually end up setting my eyeballs on two or three different "add to cart" buttons before seeing what's up with my friends list. Devious.