Thanks for your feedback.
We are currently using flash on the "RadControls for Silverlight" Overview page as we wanted this page to be consistent with the rest of the site and especially with the Overview pages of the other product lines.
We intend to swap the Flash presentation with a pure Silverlight tool (probably RadMediaPlayer) any time soon. However, there are other things to be considered with such a change and once we are ready with the UI of the new Overview page, we will update it on the site.
Once again thanks for your feedback and involvement.
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.