I get a lot of feedback by email and comments on my blog. Sorry, if I cannot answer all that fast.
What are the benefits of using AJAX?
There will be no postback to the server that will render the complete page. If you display a big table with a lot of data inside (CSS, HTML,...) the page may be about 80 kB. This big "string" must be created on the server and must be send to client also. With AJAX only the new data will be transmitted, you will save CPU usage on the web server, you will save network traffic (i.e. using slow modem connections or mobile phones/GPRS).
With the AJAX .NET Wrapper DLL you will save time develop such methods. You can simply add new methods to be exported (on thy fly).