This is another beautiful development at Adobe labs... check it here.
Along with Ajax wrapping up they have come up with a number of widgets and other nice UI layouts which can be integrated with other Ajax based frameworks like DOJO.. For example check this Auto suggest widget here. It provides a variety of ways to get the data to auto suggest like from static array, a local xml file or dynamically using a Ajax request from server..
You can find more samples here
follow up the home page for more info...