MagicAjax.NET is an open-source library designed to make it
easier and more intuitive for developers to integrate AJAX
technology into their web pages, without replacing the ASP.NET
controls and/or writing tons of javascript code. MagicAjax
initially appeared as a
codeproject article. Now it is hosted on Sourceforge and a 0.2 version supporting NET 1.1 and NET 2.0 is coming
soon. Until then you can try this
unstable cvs snapshot.