Is there any ajax toolkit for asp.net MVC
As MVC does not have ViewState or the Web Forms postback model the AjaxControlToolkit will not work with it.
There is a project to do this (http://mvccontroltoolkit.codeplex.com/) but it's not yet released.
There are numerous blogs where have got different controls working but to be honest I'd suggest looking at jQuery and its plugins (http://www.jqueryui.com/). MVC lends itself far more naturally to these, it is not control-based.