I just realized, the version of the original Doom I have is v1.666, and it takes up 13MB of space! Will the madness ever stop?!
By the way, I didn't know about 777 being God's number. However, in the Dutch version of The Da Vinci Code, the page where they start talking about 666 is page 333. That's half-freaky.
On another side note, I noticed that the Game Boy Color version of the original Grand Theft Auto, one of the characters has a 666 on her (his?) forhead, even though that character wasn't the the original PC/PlayStation version. That means Nintendo actually reverse-censored the game by putting objectionable content in!