The iPad version of the iWork apps (Pages, Numbers, Keynote) are already on track to potentially generate more than US$40 million in annual sales, according to an analysis of Apple App Store sales so far by “Silicon Alley Insider” (

In face, sales of the app have “probably” already passed $3 million in sales so far, the article says. And “Silicon Alley Insider” predicts that Apple’s overall iPad revenue could top $1 billion just this quarter.

“Also, the article says “it shows there is a real appetite for serious apps on the iPad, a device that many have shrugged off as a toy.” It also suggests that Microsoft and Google may want to make sure their office suites — whether Web-based or apps — work well on the iPad, adds “Silicon Alley Insider.”