While here at the PDC 05 in Los Angeles I got the request to upload the Fiddler inspector for Ajax.NET Professional calls. Click here [1] to download the latest Ajax.NET Professional library and the Fiddler inspector DLL. Please copy the file AjaxFiddlerInspector.dll to the folder c:\Program Files\Fiddler\Inspectors. The should appear a new inspector called Ajax.NET which will display the request and response in a tree view control.