Apple's phone is a terrific gizmo with one major short-coming: It's a silo when it comes to big files. But lots of businesses rely on their ability to share to complete projects, services such as drop.io, SharePoint, and Box are popular solutions. But until now, the iPhone hasn't helped make those services any smarter. Box announced today that it's expanding its ecosystem to the iPhone--not with an app, but with an entire API. In so doing, they've given us a glimpse of what might be ahead for the iPhone in business.