Telerik has produced a very functional set of MVC exensions. They easily integrate with Ajax. This series of samples demonstrate the extensions available in the Q10 release.
Although the documentation states that Telerik remaps jQuery(Document) to $telerik, I have found conflicts between the Jquery library loaded by the Telerik Script Manager and the version I use in the site. I have used $.noConflict to avoid these conflicts. The download shows the Javascript for the site master for your review.