I took a few minutes today to build and share this updated set of assemblies that are Mango beta-compatible for phone developers. These can also be used with the RTM of phone, SL3, etc. There were some XAML syntax errors in code that was previously not exercised, oops.

[ZIP, 518K] Silverlight Unit Test Framework Assemblies compatible with Mango Beta Tools

I’ve enclosed the license file, too. Sorry it took so long to get out, Jon.

Hope this helps.