I'm pleased to announce that the Silverlight Ribbon bar is now available in Beta version. You can check the demos online
and download the code from your accounts.
Please let us know any feedback that you have!
PS: The WPF version of the ribbon will be available within less than a month with the beta2 of the suite. Official release is planned for the beginning of November with our Q3 release.
All the best,
the Telerik team