Last night at the Consumer Electronics Show, Mr. Balmer announced that the Windows 7 Beta bits will be available for download from the MSDN and TechNet subscriber immediately. An open download of the Beta will be available Friday after Noon PST.
Microsoft Partners with MSDN or TechNet subscriptions can get the bits from this link https://partner.microsoft.com/us/40084742, after logging into the Partner Portal.
At this site you can also download the Windows 7 Online Readiness Kit.
Steve Ballmer announced during his CES keynote the immediate availability of the Windows 7 beta to TechNet