2008 is the current version.  There are two versions due out sometime early this year.  Crystal 2011 is the regular version - I've heard that there aren't many changes from 2008.  I'm not sure what the other version is called, but it is fully integrated with BusinessObjects Enterprise and will only connect to a universe - it won't allow connections directly to table.  This version apparently has a lot of new features.  These features are supposed to be available in the regular version sometime in 2012.