Actually there are a number of vizualizations on the site .. Do a search For d3 on ramblings.mcpher.com
.... Which are generated from excel using d3.js.
D3 is a framework developed by mike bostock.
Actually excel plays little part in it aside from organising the data and creating a web page from components I wrote in java script,
So the answer to your question is yes.. Many more visualizations are possible, and some have already been implemented.
Sent from my iPad