Jim Lamb has released a Windows Sidebar Gadget that allows you to view completed and failed team builds. The current version is compatible with Visual Studio 2008 Beta 1 (i.e. "Orcas") and should also be compatible with beta 2 once it's released.
You can read more about it and/or download the gadget here. Jim also provides a short video demonstration of the gadget on his blog page as well.