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.

This new sample builds on top of System.Data.OracleClient and showcases some techniques a provider writer targeting databases different from SQL Server can use.

The code is not meant for production, just a sample directed to provider writers. It has also a few limitations related both to SP1 beta bits and with types not supported in OracleClient.

For more details, read Jarek's post.

You can download the source code from our home page in Code Gallery.