Thank you MSFT for publishing (on July 14th, 2010) this document.  The screenshots are good and a couple of the scripts at the end are nice to have all in one location.

Early MSFT mentioned that there would be no migration path for Portfolio Server 2007 to Portfolio Server 2010 – this document addresses some of the approaches.  I am sure that MSFT would appreciate our comments.

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=6280aa99-3858-4044-9286-d24bb7e27ca8

Enjoy.