Pingdom using mobile web usage statistics from StatCounter posted an amazing numbers vary by continent. iOS is absolutely crushing in Australia and New Zealand. BlackBerry, once a North American phenomenon, now does well in Europe and Asia, too. Symbian remains the worldwide leader, but only because it dominates in Asia, Africa, and South America.
Since these statistics are based on mobile web usage, the numbers won't necessarily match the exact market share based on physical handsets, but rather the handsets that people use to access the Web.
Note, the iOS numbers in this article include the iPhone and iPod Touch, but NOT the iPad.