New Ajax Control Toolkit Features

DATE RANGE was added (Sept. 2011). When Using the Calendar Extender, you can specify startDate and endDate, and the user can pick a date within that range.

TWITTER control

 <asp:Twitter ID="Twitter1" runat="server"  Mode="Profile" ScreenName="MyTwitterName"/>

GRAVATAR

         <ajaxToolkit:Gravatar runat="server"

            Email="myEmail@myEmail.com"

            Size="200"

            Rating="R"

            DefaultImageBehavior="Identicon"

            DefaultImage="PathToMyImage" />