<p>What's the different between SCSF and Acropolis ?</p>

http://en.wikipedia.org/wiki/Microsoft_codename_Acropolis
http://msdn.microsoft.com/en-us/library/aa480482.aspx
Acropolis has not been released yet. SCSF is available now? Not sure what else you could find out since one of them technically is not in existence :)