Periodic Table of the USA
Was browsing Slate's series on the Periodic Table of the Elements, and what with all the various parody tables out there (desserts, vegetables and what not), I figured there had to be a periodic table of the US states - they already have handy element-like two-letter state codes! Took a quick look on Google, didn't find one (though did find a periodic table of the Europeans), so made one myself.
This one is mostly geographically accurate - and preserves some features of the real table - notably the vertical and diagonal divisions between groups. The gap at the top is roughly where the Great Lakes would be. The groups are mostly accurate representations of the various US regions. And a a bonus, in this case, the south does get to secede (almost).