Here's a link to a great post from the "award winning" Sam Batterman.
I really like this - visually it's very similar to functionality available in ProClarity dashboard today. Some of the stuff coming out of Microsoft Research is absolutely phenomonal and this is a great example. As Web 2.0 becomes more mainstream you can expect us to develop in conjunction with partners more great composite applications like this.
Here's a link to Sam's post - oh and he shows you how to populate a TreeMap control in VB.NET also.