As per the information available, the latest build of Windows 7, build 7600, has been finally RTMed. The build string of this build is 600.16385.090713-1255, means that this build was complied on 13^th July, 2009 at 12.55 pm.

Details of Windows 7 RTM build (build 7600):

MICROSOFT.WINDOWS.7.ULTIMATE.7600.16385.RTM.X86.RETAIL.ENGLISH.DVD-WZT
BUILD: 7600.16385.090713-1255
7600.16385.090713-1255_x86fre_client_en-us_Retail_Ultimate-GRMCULFRER_EN_DVD.iso
SIZE: 2,501,892,096 byte

Windows 7 Ultimate build 7600 x64
BUILD: 7600.16385.090713-1255
7600.16385.090713-1255_x64fre_client_en-us_Retail_Ultimate-GRMCULXFRER_EN_DVD.iso
SIZE: 3,223,209,984 byte

Windows 7 Enterprise build 7600 x86
BUILD: 7600.16385.090713-1255
7600.16385.090713-1255_x86fre_enterprise_en-us_VL-GRMCENVOL_EN_DVD.iso
SIZE: 2,400,387,072 byte

Windows 7 Enterprise build 7600 x64
BUILD: 7600.16385.090713-1255
7600.16385.090713-1255_x64fre_enterprise_en-us_VL-GRMCULXFRER_EN_DVD.iso
SIZE: 3,119,726,592 byte

MICROSOFT.WINDOWS.2008.SERVER.R2.7600.16385.RTM.X64.VOLUME.ENGLISH.DVD-WZT
BUILD: 7600.16385.090713-1255
7600.16385.090713-1255_x64fre_server_en-us_VL-GRMSXVOL_EN_DVD.iso
SIZE: 2,995,314,688 byte