In terms of rapid development it would be the best to choose the RIA Services. Our target is to provide full support for RIA Services with our 2010 Q1 release (currently only read operations are supported).
However, if you do not want to use RIA Services yet, I would suggest you to use plain WCF Services. You can have a look at our “Northwind WCF N-Tier Demo Application”
which explains how to create an n-tier application with WCF and Telerik OpenAccess ORM. The full source code of the demo is located here
. Although the service of this application is consumed by a web client, the approach would be similar with Windows Forms or any other client.
Hope that helps.
the Telerik team
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