Late last night, the SQL Server Release Services team announced new cumulative updates for both SQL Server 2008 RTM and SQL Server 2008 SP1.
There are too many fixes to mention, but I once again notice the trend that the "newer" branch (SP1) has more fixes than the RTM branch. I suppose they are serious about their commitment to end support for SQL Server 2008 RTM on April 13th of this year. If you haven't already planned upgrading your instances to SP1, it is definitely time to start thinking about it.
As a note, these CUs once again contain a wide variety of files. The point of these files is to allow you to download and apply only the SNAC or Report Builder updates, which are smaller files. If you are not sure that you only need an individual update, then your best bet is to always download the file "SQL_Server_2008_<SP1>_Cumulative_Update_<#>" for your platform – the installer will figure out which components are eligible for the update. I wonder when the process that creates the files is going to be corrected so it spells "cumulative" correctly?