This looked interesting so I thought I would share it.
Please let me know what you think.....
From the CodePlex Description.
The Ajax Data Controls is a DotNetSlackers project. Developed on top of Asp.net Ajax Extension, the main goal of this project is to provide rich set of data controls for Client Centric Development Model. Since the data controls of Asp.net like GridView, DataList, Repeater etc does not have any Client Side Object Model thus it is not possible to work with these controls with Web Service / Page Methods call. The included controls exposes same API in the client side as the Asp.net version with few more enhancements. Currently the project contains the following controls: