https://connect.microsoft.com/site/sitehome.aspx?SiteID=363
Microsoft is now accepting registrations for the Games for Windows Live beta. The service promises to allow PC gamers to enjoy the Live experience as well as connect with Xbox players everywhere (in games like Shadowrun, for example). Registration for the beta is fairly straight forward, especially if you've registered for a Microsoft beta before. Registrants will need a Widows Live ID and must fill out a survey to qualify.