RadControls for ASP.NET AJAX 
Telerik RadRotator for ASP.NET AJAX
Telerik RadRotator for ASP.NET AJAX Q3 2009
RadRotator for ASP.NET AJAX which is part of the Q3 2009 release is fully
backwards compatible with its previous version (Q2 2009).
Telerik RadRotator for ASP.NET AJAX Q2 2009
Telerik RadRotator for ASP.NET AJAX Q1 2009
Total redesign of the skins, which aims for a uniformity of the
appearance of all controls in the suite in the cases they are used to build
RIAs
Refactoring of the CSS code to achieve better understanding, easier
maintenance and handle problems with global styles
Changes to the CSS classes, so now all controls for ASP.NET AJAX comply
with a common naming convention
Telerik RadRotator for ASP.NET AJAX Q3 2008
RadRotator for ASP.NET AJAX which is part of the Q3 2008 release is fully
backwards compatible with its previous version (Q2 2008).
Important:
RadRotator for ASP.NET AJAX is built upon a new logic
which improves the experience and at the same time reduces the number of
properties needed to configure the control. There are two major reasons for the
new architecture being very different from RadRotator for ASP.NET. The new
version is built upon the MS AJAX convention rules and programming model and
the second reason is that we plan to add several new important reasons to the
control which would not have been possible to integrate in an elegant manner
with the old logic.
RadRotator for ASP.NET AJAX is not compatible with
RadRotator for ASP.NET, however its simplified configuration logic will allow
users to easily replace the old version with the new one. The controls is
yet to be further improved and new features will be added, providing even
better experience in the future.