17 cool magnet tricks - Evil Mad Scientist Laboratories

http://www.evilmadscientist.com/article.php/magnettricks
The Motor's my fave

via
http://hackaday.com/2009/04/22/uses-for-magnets/

Animated Sort Algorithms

http://www.sorting-algorithms.com/

YouCube by Aaron Meyers

http://www.universaloscillation.com/youcube/

The Georgia Guidestones - American Stonehenge: Monumental Instructions for the Post-Apocalypse

http://www.wired.com/science/discoveries/magazine/17-05/ff_guidestones
WIKI entry

I can't help thinking of: