The Periodic Table of Periodic Tables
(CLICK IMAGE TO SEE FULL SIZE—9MB ...and here's the deprecated Flash version with links)
Also available on Flickr make sure to read the caption if you're a chemist, self-righteous datageek, or curmudgeon.
Sorry for the lame interface here. It's not easy to display large things on the Web.
Click anywhere to zoom/drag and click the arrow icons to go to that periodic table (link will pop in a new window).
Sources: Internet Database of Periodic Tables, jonesthought, Google, Wikipedia, curiosity, restlessness, etc.
See also: 50 Sad Chairs | MILK EGGS VODKA: Grocery Lists Lost and Found based on grocerylists.org | I am keaggy.com.