The core of the Tabulator code from the creator of the world wide web is Tim Bernes Lee. It works all on AJAX. True, personally, when I tried to watch FOAF FireBug, I started to swear, which is not surprising, the program is on alpha testing. But what I saw in the example (see the link) I definitely liked it. It allows you to work with microformats and show the geo-location on Google Maps.