Via raphkoster.com:

"This is geek heaven. A Periodic Table of Visualization Methods is a triumph of cool infodesign in and of itself. It’s a periodic table, where each element is instead a means of visually displaying information. Naturally, as in the real periodic table, “elements” are clustered based on similarity. It’s done via pop-ups, which perhaps Edward Tufte might disapprove of… but I could probably fiddle with it for hours."