Most importantly, this update includes the new trace flag that will allow users running Standard Edition to enable Locked Pages in Memory.  This is a huge win for a lot of customers out there.  You can read about this specific enhancement in this blog post by Bob ...

UPDATE 2008-12-03 The download packages for the database engine have returned to the download page.  Make sure you download the file labeled ''SQL_Server_2008_Cumulative_Update_2'' to apply to machines where the SQL Server engine is present, and the file ''SQL_Server_2008_RTM_CU2_SNAC'' to apply to any machines that don't have a SQL ...