I have added this night some features for the Ajax.NET Wrapper DLL:
- new utility to write needed script tags (Ajax.Utility.RegisterTypeForAjax(Type t))
- Ajax.Utility.HandlerPath and Ajax.Utility.HandlerExtension, web.config must be changed by hand!!
- 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.