This promo was organized by Microsoft and they asked us whether we will be interested in providing free tools to all VS2008 Express registrants. We do not have the license terms that Microsoft had posted, but as far as the ribbon is concerned, you can use it in unlimited number of applications. You can read Telerik's License Agreement here: http://www.telerik.com/purchase/license-agreement/telerik-premium-collection.aspx
This offer is no longer available and is not applicable to VS2010 Express.
the Telerik team
Q3’10 SP1 of RadControls for WinForms is available for download
; also available is the Q1'11 Roadmap
for Telerik Windows Forms controls.