Tree maps
Steve Makofsky, a co-tester in Indigo has a good write up about it in his blog recently. It also helped him find a bug yesterday! Pretty interesting stuff, I am going to play with it this week.
Ofcourse I havent been keeping up with my blog reading because I just realised that Sharpreader, the tool I am using has stopped refreshing my subscriptions. Got to see what's happening.