Let the 3rd party EF providers roll!
I know I haven't been making posts with much in the way of original content for quite some time. My apologies.
In the meantime, I just can't resist pointing out this post on the ado.net team blog: http://blogs.msdn.com/adonet/archive/2008/09/05/devart-s-new-providers-support-the-ado-net-entity-framework.aspx This is really cool! You can now use the EF against Oracle, MySQL and PostgreSQL.