I work on the Entity Framework Team at Microsoft.
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.