Update: Minecraft: Minecraft XBLA builds up 4m sales, averages 27,000 a day

[Barozi]

Thanks for the heads up. That game has just incredible legs.

Going by the press releases:

May 9th (Release day)
May 14th - 1m
June 4th - 2m
July 20th - 3m
August 28th - 3.6m
September 30th - 4m