The title is self-explanatory. I like how with AJAX you can use it to check your database live to see if a username is available, without reloading the page. I noticed that in your article "The JavaScript Trap" you state: "Our tentative policy is to consider a JavaScript program nontrivial if: it makes an AJAX request or is loaded along with scripts that make an AJAX request"
I noticed there are some free libraries that use AJAX, would that be a good place to start? Or will any AJAX code I use be considered non-free? Regards - D
