Discovered a world of possibilities lately? Someone has, as the BlackBerry App World has just soared past the one billion download mark. It took a smidge over two years for the company to claim the milestone, if you count both smartphone and PlayBook tablet purchases. Android Market took about the same amount of time to reach the mark, but has soared to greater heights since, while Apple has averaged nearly a billion downloads per month in each of the last six months. A number of factors have likely led to the relative snail's pace in the BB storefront, including the outfit's rocky relationship with developers. In what can be seen as a morale booster, the company has begun a video series that allows seasoned RIM aficionados to offer their rationale for working with the mobile OS. Perhaps this will, in theory, help expedite the milestone conquering -- only time will tell.