Data Visualization Tool: Mondrian
I just found this amazing free tool that can do some smart data visualization with the simplest sets of data comparing to other visualization tools. You can just import basic excel files or even txt files with huge chunk of data and it will categorize and visualize them.
Graphics and interface might not be as sexy as what you see on informationisbeautiful, but it can definitely help you understand the relationships between groups of numbers. It generates basic bar graphs as well as graphs like below.
Download it and play around with their sample data, you will see what I mean.
