I as posted earlier too on http://www.touchgraph.com (TG), which I have been following it since my college days and am quite fascinated with the idea. I still have the java code for it and the tweaks and enhancements I made in it. 🙂
Now that Google has officially owned this incredible tool I presume it will gain more acceptance as a search and collaboration system. Visit http://www.touchgraph.com/TGGoogleBrowser.html for more.
Also visit: http://www.tafiti.com/ for Microsoft version of the concept in silverlight. Its really fascinating.
Searching has surely changed. It never be same again once you have experienced the above three.. 🙂
Mail me your comments/ suggestions.