The "PerformancePoint Server 2007 Planning Data Migration Tool" is now available on TechNet and the MS Download Center.

Documentation: http://technet.microsoft.com/en-us/library/cc512833.aspx

Download: http://www.microsoft.com/downloads/details.aspx?FamilyId=FA1C6CAD-45BD-4E5C-A257-4BBA84FA4224&displaylang=en