We've just released an update to Expression Encoder 2 that allows VB.NET developers to build solutions using the Expression Encoder 2 SDK

You can get the update here:

http://www.microsoft.com/downloads/details.aspx?FamilyId=8727DD51-61B3-4692-ABDE-4FDD2779B0D0&displaylang=en

The cool part is that the update is only required on developer machines.  Any apps created in VB.NET on a machine with the fix will run against the unmodified Expression Encoder 2 release bits.

Hope this helps

James