Service pack 2 for Exchange 2010 has now been released
http://blogs.technet.com/b/exchange/archive/2011/05/17/announcing-exchange-2010-service-pack-2.aspx
One feature that has been long overdue is the ability to segment the GAL so that only certain elements of the GAL are visible to specific groups of users (EG: Only let System Administrator’s see Administrative Accounts…..)
I’ll post a full update once I have applied it to my Lab environment…