Apple has a thing with ten billion. The outfit served up its ten billionth iTune right around this time last year, and more importantly, served its one billionth app in April of 2009. In just 1.5 years, the company has seen that figure soar nearly tenfold, which is impressive no matter how you slice it. Of course, we're quite curious to know if this includes duplicate downloads, app updates and just free or paid apps, but regardless, there's no question that Cupertino (and quite a few developers) are raking it in. Of course, the explosion of the iPad certainly helped boost the download frequency, and if we had to guess, we'd say it'll take even less time to double up this milestone. You know, once next month happens. Oh, and if you get lucky enough, you could score a $10,000 iTunes gift card if you just so happen to download the ten billionth app -- make sure it's a good one.