Just to get the news out: The updated version of the Entity Framework Sample Provider that is compatible with .NET 3.5 SP1 Beta is now available in our Code Gallery page. From the description:
The Sample Provider wraps System.Data.SqlClient and demonstrates the new functionality an ADO.NET Provider needs to implement in order to support the ADO.NET Entity Framework
- Provider Manifest
- EDM Mapping for Schema Information
- SQL Generation
Update: for more details on provider API changes since the Beta3 release, you can read Jarek's post here.