RIM’s market share over the same period collapsed, dropping almost 5 points. Apple’s share increased slightly, but is dead in the water and has now fallen way behind Android. Android now has a third of the US market (33%). RIM’s share has plummeted to 29%. Apple is holding at 25%.
Apple’s share slightly increased in the last few months prior to the point when people think they’re going to bring out a new model. Android gained users who jumped ship from BlackBerry, Windows Mobile and Palm, but not the iPhone.
Also, as Gruber points out, these figures don’t reflect other iOS device marketshare, meaning the development opportunity (which this article argues about) is much broader on Apple’s devices.