Smartphone sales per OS vendor
Stats from June 09 shows Symbian being the clear leader in the Mobile OS market, thanks to Nokia and a few Sony Ericsson and Samsung devices.
(data does not include Palm WebOS, which was introduced in June, 2009)

It will be interesting to see what the chart will be for Q2 2010 with new Android phones introduced every week or so, Windows UX-focused Mobile 7, and Samsung's Linux-based, Bada.