I've been testing the DotNetSlackers' AJAX Data Controls for a little bit and they're definately cool. I ran into an issue, however, when trying to build an app with one of the controls in Visual Studio 2008 (.NET Framework 3.5). The assembly
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Read the complete post at http://weblogs.asp.net/jgaylord/archive/2007/11/06/using-older-ajax-controls-in-visual-studio-2008.aspx