Beta 2 for VS 2008 was made available at the end of the last week. It inclues beta releases for standard, professional, team system editions and the MSDN library.
It also includes the beta 2 for the .NET Framework 3.5 and a CTP for the Silverlight add-in for VS 2008 that allows you working with Silverlight from VS 2008.
You can get the new beta from here: http://msdn2.microsoft.com/en-us/vstudio/default.aspx.