Visual Studio 2008 "Orcas" Beta 2 and Silverlight

OK, have passed one hurdle in getting Scott Guthrie's Silverlight samples to work with VS 2008 Beta 2.  The trick suggested by Samsp on the Asp.Net forums is to change the version numbers for the assemblies in the web.config to 3.5 from 2.0.  That did the trick and resolved the missing assembly reference error I was getting when running the sample web app:

Parser Error Message: Could not load file or assembly 'System.Web.Extensions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

I still have a problem with the samples not seeing Silverlight installed - whenever I run I get the install logo - but I think that has to do with some GUID or version mismatch in the code.