Windows 7 SP1 Released.

[MipMapper]

Microsoft have released "Windows 7 and Windows Server 2008 R2 Service Pack 1 (KB976932)" here - Validation Required.

• 7601.17514.101119-1850_Update_Sp_Wave1-GRMSP1.1_DVD.iso - This DVD image contains standalone update for all architectures
• windows6.1-KB976932-X86.exe - This application installs Sp1 to a 32-bit machine running Windows 7
• windows6.1-KB976932-X64.exe - This application installs Sp1 to a 64-bit machine running Windows 7 or Windows Server 2008 R2

Also available on the same page are the debugging symbol files.
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Softpedia also provides the all architecture DVD image: here

• 7601.17514.101119-1850_Update_Sp_Wave1-GRMSP1.1_DVD.iso - This DVD image contains standalone update for all architectures

SHA-1 Hash of 7601.17514.101119-1850_Update_Sp_Wave1-GRMSP1.1_DVD.iso from social.technet.microsoft.com/Forums
F2AB A110 2E18 EAD0 8C78 527A B422 C09A B7D1 F54C

SHA-1 Hash of 7601.17514.101119-1850_Update_Sp_Wave1-GRMSP1.1_DVD.iso from Downloaded from Softpedia - sha-1 generated by summerMD5
F2AB A110 2E18 EAD0 8C78 527A B422 C09A B7D1 F54C

[Tom@CP]

The upgrade can only be used to an upgrade an old version of Windows like Windows XP.