Display of Quantitative Information

I am interested in good information display and in why so many attempts at displaying quantitative data are not very good.

Why, for example, are the default graphics in Excel so bad. It isn't that hard to make them better. But that is a topic for another post. I wanted, for now, a place to collect good examples.

Good examples

Edward Tufte the author of Visual Display of Quatitative Information has a terrific web site.
Majority Watch nicely illustrates the political balance in the upcoming US elections (uses Flash).
A wonderful computer animation inside the cell. Not strictly quantitative data representation but compelling nonetheless.