Android Market revenue will skyrocket by 295% percent in 2011 to an estimated $425 million, putting it on a path to second place and unseating RIM's Blackberry App World on the way. iSuppli estimated that Android Market will handle 5.8 billion app downloads this year.

App World and Nokia's Ovi Store will bring up the rear, with projected revenues of $279 million and $201 million respectively. Kent said that neither store will challenge the top spots held by the App Store and Android Market.

Not on iSuppli's list for 2011 is Microsoft's Windows Marketplace, but Kent said that it and perhaps others, "[could] conceivably could gain enough size and presence in the future to shake up the market."

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at or subscribe to . His e-mail address is .

in Computerworld's Mobile Apps and Services Topic Center.