The ADO.NET team has been working hard on a new release of the Entity Framework with a boatload of new features (I haven’t played with it yet, probalby this weekend). I know they are under some pressure as the June CTP shipped on July 2nd. Check it out if you want to see where they are going.
Caveat, it only works with a June CTP of VS 2008 Expression Web Edition. Not the Orcas Beta 1 or any other edition. I hope they release a VPC soon but I am not holding my breath waiting.