Bill Gates = 666

This one's hardly original with me, but it's worth repeating: the letters in Bill Gates' name add up to 666.

That's right, take the letters in his name— "Bill Gates III"— and assign them their ASCII value, with "3" for the ordinal "Third":

 B    I    L    L   
66 + 73 + 76 + 76 +

 G    A    T    E    S   3
71 + 65 + 84 + 69 + 83 + 3 = 666

Uh, I think next comes Windows Vista, Digital Rights Management, and an RFID chip implanted in your forehead or right hand. ;-)