Milan Negovan has compiled a series of 'cheat sheets' for the Microsoft AJAX Library. These make a handy dandy reference. Sounds like he's working on additional ones, so I'll have to check back.
I would like to find out more what you have done with AJAX. Have implemented same but for different purpose. Initially I did not grasp the what AJAX was all about, but, through trial and error, learned a great deal. So, am curious to find out what you discovered.
Local ASP.NET guru, Milan Negovan , has posted another in his fine series of "cheat sheets" on the Microsoft