Thanks for the help from Alvin (MS MVP) and Chris (MS staff), I got my bizspark account ready now. For people like us, make a living from tools, servers made by Microsoft, to able to access all these tools and servers is very important to us.

DotNetNuke is the best open source CMS available in Microsoft .NET world. The current versions, 4 and 5, has full support for Ajax. You can create modules with all ajax support. This article just discuss one very basic issue.