Sample Ap
telerik r.a.d.ajax framework
http://www.telerik.com/asp-net-controls/r.a.d.ajax/features.aspx?b204F=a
Direct Web Remoting
http://getahead.ltd.uk/dwr/index
AJAX made simple with DWR
Start using AJAX in your Web application with DWR
http://www.javaworld.com/javaworld/jw-06-2005/jw-0620-dwr.html
Yahoo! User Interface Library
http://developer.yahoo.com/yui/index.html