While Vic Gundotra, Google’s developer evangelist, argues that mobile applications will be sold through Web browsers rather than app stores controlled by handset makers, most mobile apps today are sold through app stores.

Microsoft Windows Mobile (for which there is no app store at this point) aside, Apple’s iPhone, Nokia’s Symbian, Google’s Android and Research in Motion’s BlackBerry operating systems all support the open source Webkit or HTML 5 standard, which in theory should make it easy for developers to create applications for all those devices. The reality, however, is somewhat different. William Bereault, director of research and development for Apple App Store mobile apps vendor Never Alone Anymore, told me last week in New York that, “in theory you can port the apps to another OS, but it’s not easy,” he said.

Never Alone Anymore decided to focus on Apple’s App Store, at least for the time being, because Apple provides a familiar payment system for customers and handles back-office work. Bereault also told me that the most recent developer kit Apple introduced this spring includes support for more types of attractive features like localization and notifications.

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