Few days ago, the service pack 2 of Windows Vista was leaked.
Now, the full installation ISO is also available…

x64 Version
BUILD: 6002.18005.090410-1830
FILE: 6002.18005.090410-1830_amd64fre_Client_en-us-FRTMCXFRE_EN_DVD.iso
SIZE: 3,861,460,992 byte
SHA1: AAEE3C04533899F9F8C4AE0C4250EF5FAFBE29A3
MD5: A1C024D7ABAF34BAC3368E88EFBC2574
CRC: 80B2EDB5

x86 Version
BUILD: 6002.18005.090410-1830
FILE: 6002.18005.090410-1830_x86fre_Client_en-us-FRTMCFRE_EN_DVD.iso
SIZE: 3243413504 byte
SHA1: 25AD9A776503E6A583BEC07879DBCC5DFD20CD6E
MD5: 19CA90A425667812977BAB6F4CE24175
CRC: E2AD10F9