AJAX Pattern Screencasts
At Andre's Blog he has a nice entry where he is trying to collect screencasts of AJAX patterns in action. First, I haven't really thought of these things as AJAX patterns before but after checking this out I can understand why that label is being applied. Second, I see no better way to illustrate these patterns than through screencasts like this. It would be very difficult to express what is really happening in the individual pattern otherwise.
Reference: Ajaxian