Ajaxium

From Ajaxium:

Ajaxium replaces ASP.NET postbacks by AJAX, transforming existing ASP.NET applications to Web 2.0 without JavaScript callbacks or server-side coding Designed as an ultimate solution for ASP.NET developers, Ajaxium is compatible with all browsers supported by ASP.NET. In contrast to other AJAX-based approaches and huge AJAX frameworks, sites powered by Ajaxium remain accessible to all search engines and old browsers due to an automatic and silent degradation to the classic ASP.NET. One of the Ajaxium advantages is that the client-side code doesn't rely on the browser's version and there is no hard-coded 'browser compatibility list' built-in.Even if modern browsers have their required features disabled or inoperable, Ajaxium silently and gracefully falls back to the standard ASP.NET without any error messages or page reloads. To increase accessibility further, Ajaxium allows you to switch back to ASP.NET at any time and respond to any visitor. Ajaxium supports all default ASP.NET and custom controls, plus most third-party ASP.NET controls with minimal compatibility limitations. Ajaxium is not a huge framework or another big set of AJAX-enabled controls, but a component which makes existing ASP.NET code AJAX-enabled. So it will save your from rewriting your existing controls, in-house code library or code generation frameworks from scratch. With Ajaxium, not a thing needs to be changed in the existing ASP.NET programming model. The 'code noodle' - a big mix of business logic code, Javascript and HTML, a common catch of the traditional AJAX applications which often causes failures of complex AJAX projects - will never bother you once you are armed with Ajaxium. Ajaxium increases developers' productivity, making their job as easy as creating traditional ASP.NET applications. Working only with classic ASP.NET 1 or 2 in any of the .NET languages, developers can create complete AJAX solutions faster than their competitors making use of conventional techniques.