Good resources. While pre-build AJAX libraries/wrappers/frameworks whatever you call it, might be a nice thing - I wouldn't recommend them for people just starting out with AJAX. There's a couple of reasons for that.. one being that you don't get to understand how AJAX workes without writing the code yourself. Even if you're just writing the examples off a book word by word (as I tend to do), while doing that you learn what each function does and how they're named etc. it's good practise :D. For the user that knows all this, by all means use these libraries if it helps faster development. Also some very nice AJAX/Javascript/PHP tutorials on this site: http://www.ajaxprojects.com/ and other goodies.
