I just found a open source application that will help speed up your Ajax development. Their website says that it can cut down development time by 90%. Below is a brief description of the application. The best part about the application is that it is open source, and you can modify the source code to fit your needs.
Visual WebGui (VWG) is an open source rapid application development (RAD) framework for Line-Of-Bussines AJAX & Silverlight GUIs. VWG cuts down development time (proven up to 90%) , without compromising on extensibility, scalability, performance, security or complexity.
I have been working with the application for about a week now and have found that it is very helpful. I am pleased to say that it really does cut down on development time. Maybe not 90%, but a time saver.