I took it myself (and Stephen is probably tracking my answers!) -- it's very cool and quickly teaches a good lesson in good vs. bad graphics and tables. You will be strongly discouraged after it to abuse color, 3D, etc.
If you got hooked, Stephen has a big bag of goodies for those who want to learn about creating good graphs and tables. He wrote a beautiful book called "show me the numbers"
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihyphenhyphenuDB5j2xohqpd4wiJfABWAQBCcTzPJ3V4xX5oJ5IWWp8c1cpTAhpTCOmmwOZFMPoEc5trB4GN-BDr-AavWbLV4sr10QMBbowvT0pM3aFZvbClmKqOTynjfA31_pyO4S95rDNAw/s200/Numbers_Cover.gif)
His website's Library also included an abundance of useful articles.