Looking at relative smartphone platform traffic in the US, the iPhone has dropped several points from its 55 percent last fall, but still holds nearly half the share. Android in particular has seen huge growth, nearly catching up with the iPhone's share over the last several months as a number of Android-based devices have been released on the market. The Motorola Droid has been especially helpful in this drive, along with a number of HTC devices. RIM has slowly declined, while webOS and Windows Mobile continue to stagnate at the bottom.
More info at ARS Technica.