I've been following AJAX and it's integration into our 'webbed' world for a while now. This article takes a look at the current state of AJAX and how it's come along
Some of the best sites that are now using AJAX are listed on pages two to seven. When I first heard of AJAX I started to learn to use it, going so far as to get a book from the local chapters. When I asked if they had one they said, 'no'. When I asked if they could get one they said, 'no'. And along with everything else in my life I just let it go and decided not to bother. It's a shame because it seems like a useful piece of knowledge to have these days.
I thought it may just be a passing fancy at first, but it looks like it may be worth looking into again.