It is our pleasure to present you the much improved and completely new RadDock for WinForms (Q2 2009 Beta). You can find detailed information on what is new and improved here:
RadDock for WinForms Q2 2009 Beta.Project upgrdaing instructions are also included.
The beta is available for download from your Telerik accounts --> Downloads (or Free Trials for the trial version) --> RadControls for WinForms:

We are eager to get your feedback on the RadDock beta, so please use the
WinForms Beta Forum to send us your comments.
Enjoy!
All the best,
The Telerik Team