I came across this white paper published by Microsoft:
http://technet.microsoft.com/en-us/library/cc990273(v=office.14).aspx
It looks like in order to get the full features of PerformancePoint you may be looking at the SS 2K8R2 Enterprise,
Kurt
Kurt W. Zimmerman
SR DBA
Lefrak Organization
New York, NY
http://www.linkedin.com/in/kurtwzimmerman