Step 16: Solve the cube!
Want to buy one? I'm going to make five sometime this summer (2012). They will be to an improved design (bigger lazy Susans, different joinery, high quality Baltic birch plywood, simpler magnet system). They'll cost about $6-800 + shipping (about $150-200 to the US, slightly less in Canada). If you're interested, send me a PM and you'll get first right of refusal.
Many thanks to the following sites for featuring this build: make, boingboing, hackaday, neatorama, ohdeedoh, geekosystem, technabob, manmade, babble, wins.failblog, design-milk, storagegeek, discovery, thisiswhyimbroke and others; thinkgeek for tweeting about it, and of course instructables users for all the great feedback. Cheers!
Some people have even made replicas! See here, here and here. If you make one, please send me a link or post a picture in the comments.