A source close to Microsoft has confirmed to me that Windows Vista will in fact carry the build number 6.0.6000. He found this out by receiving a mail with the build stamp "Microsoft Windows Mail 6.0.6000.16384" so that ends that speculation.Also the MSDN subscription page has been updated with the following information

Windows Vista and Office 2007: Availability on MSDN Subscriber Downloads
Windows Vista and Office 2007 will be available through MSDN Subscriber downloads within 7 days of release to manufacture (RTM). MSDN Subscriptions is committed to making new content available to our subscribers as soon as is practical.

Several key Mi ... more

PowerDVD is the latest evolution of the world acclaimed DVD software program that offers maximum video and audio playback entertainment on the PC. It comes complete with numerous customizable video/audio controls that can deliver the highest quality viewing and listening experience. PowerDVD incorporates support for high-definition audio and video, true 8-channel home theater audio playback, virtual surround sound, as well as complete controls and extra features for DVD enthusiasts.

Download Link Fixed!
New features for PowerDVD Ultra include:
Support for HD DVD and Blu-ray Disc playback on leading drives, including the ... more

Windows Media Player 11 for Windows XP offers you unmatched choice and flexibility for your digital media. Easily manage your libraries of digital music, photos, and videos on your computer, and then sync with a variety of portable devices so you can enjoy it all wherever you want.PLEASE NOTE: If you use Windows Media Player to access a favorite online store, some are not available for this beta release. The following stores are available in the Windows Media Player 11 beta release: Audible, f.y.e., Live365, Movielink, MSN Music, Napster, Passalong, Puretracks, URGE, Wal-Mart and XM Radio. For more information, see the Re ... more