Have you checked Microsoft's latest ASP.NET AJAX 1.0 RC? It is just out and some of the features added include dynamic invocation of web service proxies, additional globalization support and substitution logic, compression and caching support for the Script Resource handler.

The enhanced features of the Microsoft ASP.NET AJAX 1.0 RC are:

• Parsing support in the client for Globalization.

• Dynamic invocation of web service proxies, and substitution logic, compression and caching support for the Script Resource handler.

• Changes to ASP.NET AJAX namespaces and assemblies to ensure compatibility between ASP.NET AJAX 1.0 and ASP.NET AJAX in the .NET Framework release code-named "Orcas" for user-developed applications.

Also the Control Toolkit has been improved with new controls such as MutuallyExlcusiveCheckBox, DropDown and ValidatorCallout. It's all set to redefine your web experience for sure.