This graph goes to 2 billion

So about a year ago we posted a graph by Mad Dog in the Fog showing the meteoric rise in iTunes sales. At that time, iTMS (as it was called back then) had busted the 1 billion mark. Now there's another graph showing that super-dee-duper TWO billion mark. What a difference a year makes. Well, almost a year. Now the question becomes, will we see just another billion next year, or will the curve continue, taking us to 4 billion by the end of Q1 2008? As they say, time will tell.

[thanks MD, again!]