I published a post last week on the System Requirements for PerformancePoint Server. I need to make one clarification as Derek - very kindly pinged me an email to check. Thanks Derek
This is a subject which has already confused some customers and partners who have downloaded the PerformancePoint data sheet from here and noticed that it suggests SQL Server 2005 Enterprise Edition is requirement and pre-requisite.
So here's the definitive answer.
For Planning specifically there is a requirement to run SQL Server 2005 Enterprise Edition as Planning requires cube writeback dimensions, which is a feature of SQL Server Enterprise Edition. For Monitoring and Analytics it will run fine on SQL Server Standard Edition.