Btw, how do you use random.org to select who wins? By post number?
That's completely up to you. If you go by post number though, someone who posts more than once have a higher chance of winning, so I'd make a tally of everyone who entered then throw that list to the mighty random.org.
I already have the game, by the way, which is why I didn't enter a number and thus don't enter the giveaway.