Via Metafilter, Benjamin Fry, who is interested in displaying large datasets in visual form, has an installation at the Whitney Museum. Of course I *should* be looking at the haplotype blocks comparing two humans' DNA, but I prefer the baseball salaries graphic. Ben Fry has put a lot of thought and documentation into this.
Take a look also at his Anemone which displays the click habits of visitors to the MIT media lab web page.
Very cool stuff.