I notice that the latest Australian MSDN Flash from Frank Arrigo mentions IdeaBlade DevForce, a (quite mature) object-relational mapping tool:
Complimentary DevForce Express
Cut down the time you spend developing data-intensive client/server applications. Get IdeaBlade's DevForce Express, a developer productivity solution for .NET that is fully integrated with Microsoft Visual Studio. DevForce: helps professional developers build, maintain, and operate smart client Internet applications by bridging the infrastructure gap between the Application layer and .NET. The solution is a "must have" for .NET development that will improve your productivity and increase application quality, reduce overall costs, and accelerate time-to-market.
I have been using the...