Although the public beta for Windows 7 beta will only available on January 9, 2009, the MSDN and Technet subscribers can now start downloading the DVD ISO media together with a genuine working product key to activate the Windows 7 installed.

The details of the DVD ISO image available for download form MSDN and Technet are:

Windows 7 Beta (x64) – DVD (English)
File Name: en_windows_7_beta_dvd_x64_x15-29074.iso
Date Posted (UTC): 12/30/2008 4:26:48 PM
SHA1: E09FDBC1CB3A92CF6CC872040FDAF65553AB62A5

Windows 7 Beta (x86) – DVD (English)
File Name: en_windows_7_beta_dvd_x86_x15-29073.iso
Date Posted (UTC): 12/22/2008 2:41:15 PM
SHA1: 6071184282B2156FF61CDC5260545C078CCA31EE

The SHA-1 hash values for the ISO from MSDN/TechNet is exactly the same with the leaked build 7000 or 32-bit Windows 7 Beta and 64-bit Windows 7 Beta.

Windows 7 Beta Downloads at MSDN and Technet

Also available is the language packs for Windows 7 Beta:

Windows 7 Beta Language Pack (x64) – DVD (English)
File Name: en_windows_7_beta_language_pack_dvd_x64_x15-29110.iso
Date Posted (UTC): 12/22/2008 2:41:17 PM
SHA1: 75788ACD5BA5095631287DC874C48287601F4047

Windows 7 Beta Language Pack (x86) – DVD (English)
File Name: en_windows_7_beta_language_pack_dvd_x86_x15-29103.iso
Date Posted (UTC): 12/22/2008 2:41:13 PM
SHA1: 761A54487B2696E5B8596B7633B3F7533ACE5E0B
ISO/CRC: 7E8005D4

Windows 7 Beta is available in MSDN and Technet via MSDN Subscriber Download page or TechNet Subscriber Download page. Downloaders must have an active subscription account to login to access the download and generate the beta keys.