Although a few other sites have already posted this, it is far to cool to pass up, the androiddevelopers have created a couple minute long youtube video that shows the rise of Android activations all across the world from 2008 until January 2011.
They’ve even added a few cool countdowns like to when the Droid was first launched and the Galaxy S and you can see some real spikes as they launch. Overall it’s a really cool video and deserves to be shown to all (especially those iPhone lovers).