 <p>Are you willing to pay for it? Most of the big third party vendors e.g. Infragistics, Telerik etc have such a control. Here is a link to a demo of the Infragistics tag control:</p> <p><a href="http://samples.infragistics.com/sllob/ComponentOverview.aspx?cn=tag-cloud" rel="nofollow">http://samples.infragistics.com/sllob/ComponentOverview.aspx?cn=tag-cloud</a></p>