DotNetSlackers has just released Ajax Data Controls (ADC) as open source. The project is hosted at codeplex and there are several live examples which can be seen at the samples link below. 

The ADC contains an AjaxGridView, AjaxDataList, AjaxRepeater and we are going to add more controls very soon as well.

To get a feel for them, check out the samples page. Very cool stuff by “TheSlackers” !

Project home: http://codeplex.com/ajaxdatacontrols
Live Samples: http://dotnetslackers.com/projects/ajaxdatacontrols
Team Blog: http://dotnetslackers.com/community/blogs/sonukapoor/default.aspx
Team Blog: http://weblogs.asp.net/rashid
Forums: http://dotnetslackers.com/community/forums/71.aspx