The latest binaries of our Silverlight 3 controls can be downloaded as part of the latest internal build that is available under each user's account. We will be working on officially launching our RadControls for Silverlight suite against the latest official Silverlight 3 RTW with the forthcoming SP1 release. Then you will be able to fully explore our examples and controls entirely built against Silverlight 3.
Nikolay Atanasov was Product Manager in Telerik AppPrototyper Team.