There are some recent Blog posts that describe a command that will completely remove all of the uninstall information for the Service Pack 1 Beta to free up some disk space. Some of these blog posts do not go far enough when describing the consequences of using this procedure.
Please remember that if you have the Service Pack 1 Beta installed on Windows 7/Server 2008 R2, that you will be Required to uninstall the SP1 Beta before you can install the Final (RTM) version of SP1 when it is released.
Just to be perfectly clear, if you use that command to remove the SP1 Beta Uninstall information, you will be required to completely reinstall Windows 7 or Server 2008 R2, or use a complete System Image Backup, created prior to installing the SP1 Beta, before you can install the Final (RTM) version.
Please consider this information carefully before using that command.