Via Adrian Downes:
Exam number 70-556 for PerformancePoint Server 2007 is now available for those interested in adding another MCTS arrow to their certification quiver.
Prometric already lists the exam on its site. Unfortunately, at the time of this writing, Microsoft Learning does not yet have the exam listed. Nonetheless, we have access to Trika Harms zum Spreckel's preview of the requirements from when the exam was in its beta phase here.
UPDATE (29 Jan 2008): the official preparation guide for the exam can now be found at http://www.microsoft.com/learning/exams/70-556.mspx