I have added a simple feature that will enable queuing for Ajax.NET requests. You can enable the queue with following line:
AjaxPro.queue = new AjaxRequestQueue();
The processing of the queue will start when the first call is made.
The beta files for .NET 1.1 and 2.0 can be found in the attachment (without the example files) in the Google group [1]. I have done only some tests on IE, maybe you have time to give me any feedback [1].