According to August data from The Nielsen Company, Android is now the most popular operating system among people who bought a smartphone in the past six months, while Blackberry RIM and Apple iOS are in a statistical dead heat for second place among recent acquirers.

The Nielsen data covers a period that includes a full-month of iPhone 4 availability. (The device became available at the end of June 2010).

Among all smartphone owners, Blackberry still holds the dominant share with 31 percent of the market, though its lead over Apple is declining. Twenty-eight percent of smartphone owners have Apple iPhones, compared to 19 percent who have Android devices.