http://kotaku.com/5689669/alan-wake-...ames-on-demand
I've bought a few games on the marketplace. It's very nice to not have a disc to lose or break and redownload later if I need to. Prices are mostly fair, but if it's an old game or an unpopular one, you'd end up spending $20 or $30 on a $5 game at Gamestop.