Microsoft released the first service pack for Visual Studio 2008 today. Download from the links below:
Microsoft Visual Studio 2008 Service Pack 1 (exe)
Microsoft Visual Studio 2008 Service Pack 1 (iso)
Visual Studio 2008 Team Foundation Server Service Pack 1
Read the details on what's new in SP1 here. Some of the Team System goodies include drag-and-drop support for adding files, version control of unbound files (not in the current solution) and noice and performance improvements in the team build reports.
And as usual, Brian Harry has a post with lots of detail about the service pack. I recommend you read the notes on TFS in particular.