OK, so this is officially the coolest thing I have seen this year. Just to warn you, you probably won't get that excited about it, but I think it's friggin' AWESOME.

NumberSpiral.com - really hard to explain without pictures (and the images are copyright so I can't post them here). Basically, he makes a number spiral by starting with 0 at the middle , then rolling the numbers around it like a ribbon, keeping square numbers next to each other. Zooming way out you can see cool patterns regarding prime numbers and other stuff.

The beauty of math sometimes blows me away. :)