Windows Vista Beta 2 has officialy been released to testers, via Microsoft's Connect portal. The build number is 5384.4. Windows Server "Longhorn" has also been released to testers. The packages are available for both the x86 and x64 platforms.
The Vista Beta 2 x86 DVD is 3,200.15 MB, and the x64 DVD is 4,109.73 MB. The package contains Ultimate, Home Basic, Home Premium, and Business binaries. As ever, the key used is what determines what SKU you see.