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this actually happened yesterday, but the mod DayZ for Arma 2 hit 500k people. grats to them. what i thought was interesting was one month ago they only had 100,000 people. gaining 400,000 people in a month from word of mouth is pretty impressiveto say the least. hell, they've gained 25,000 people since yesterday so far. i know it's just in alpha and still full of bugs, but i have to say.. this was the best 30$ i've ever spent on a game. the actual game Atma 2 is pretty decent as well.
post is on Massively here: http://massively.joystiq.com/2012/07/12/dayz-shooter-mod-reaches-500k-users/
and the front page of the dayZ website updates how many registered users. http://dayzmod.com/