As you may already know, the imminent iPhone 2.0 software is set to provide more document viewing capabilities, including readers for PowerPoint, Keynote, Pages, and Numbers. However, while these readers will certainly be handy, Apple still has not announced any plans to provide a way to edit docs on the run—a capability especially important to those of us interested in mobile learning.

Today, our friends at TUAW report that at WWDC ’08 Mariner Software announced their plans to mitigate part of this editing dilemma with the release of Mariner Calc for the iPhone, the popular Excel-compatible spreadsheet for the Mac, which will provide iPhone users with the ability to view and edit Excel files in their native file format. According to company president, Mike Wray, Mariner Calc for iPhone will support multiple sheets per document, charts and objects. In addition, the app boasts a maximum of 1,000,000 rows and 32,000 columns.

TUAW asserts that Mariner Calc for iPhone is about 80% of the way to completion and is expected to ship about the time the virtual doors open on the App Store. No price has been set for Mariner Calc for iPhone, but expect this little spreadsheet to be a popular purchase from the App Store.