The official source of information on Managed Providers, DataSet & Entity Framework from Microsoft
It is my pleasure to announce the first (to the best of my knowledge) external providers to support the ADO.NET Entity Framework!
Devart (formerly Core Lab) has released a new version of their ADO.NET providers, which includes support for the Entity Framework. For more information, see the following announcement on Devart's web site. Congratulations to the folks at Devart!
With the release of Devart's providers, developers can now acess their Oracle, MySQL and PostgreSQL databases via the Entity Framework. I've downloaded and used their OraDirect.NET provider to successfully run sample queries against an Oracle database using both LINQ and Entity SQL.
ADO.NET Program Manager