Windows 7 RTM and Windows Server 2008 R2 RTM are now available for download on MSDN for MSDN and TechNet subscribers. Currently, the only available bits are in English. The other languages will become available on October 1st. Volume License customers with an existing Software Assurance license will be able to download the bits starting tomorrow.
For more information on these releases check the Windows Team Blog.
Update: Windows Server 2008 R2 is not yet available.