Mary Jo-Foley states that Microsoft will take the next step in putting Vista behind it as it makes the Windows 7 Beta 1 release available to Connect testers, Microsoft Developer Network (MSDN) and TechNet subscribers in parallel to CEO Steve Ballmer Consumer Electronics Show (CES) keynote which begins at 6:30 p.m. PT.
Microsoft has a webcast of the keynote and a set of prepared videos on Windows 7, Windows Mobile and the future of computing.
Update: 9:50 EST - Microsoft has a link on MSDN through the target page is not yet available.
More information is available on the Windows team blog and the new Windows 7 page.