I have added this night some features for the Ajax.NET Wrapper DLL:
- fixed several bugs for DataSet and DataTable - added exception handling - fixed return value with more than one line, special chars removed - removed the document.title change, the Ajax.NET Wrapper will be still free for everyone!!!
- C# sample is using Ajax.Utility - VB.NET sample now using own classes
Download new Ajax.NET Wrapper DLL: http://ajax.schwarz-interactive.de/download/ajax.zip  Download C# and VB.NET samples: http://ajax.schwarz-interactive.de/download/ajaxsample.zip 
I will upload a documentation (thanks to Karl) tomorrow morning. There will we a MSDN like overview of all the classes, too.