If you look at the Tech Specs page for a Cinema Display, the specs say "Compatible with VESA FDMI (MIS-D, 100, C) compliant mounting solutions. '''(Requires optional Cinema Display VESA Mount Adapter, M9649G/A)"'''
So if you ''get the M9649G/A, or perhaps this generic [http://www.amazon.com/APPLE-M9649G-Adapter-Cinema-Displays/dp/B0002YL5XU|an Apple VESA Mount Adapter]'' you should be Golden.
''If this answer is acceptable '''please remember to return and mark it'''.''