Tom Saxton shared his experience of using Google Docs API in an iPhone App called “Grocophile”. One of the most common requests from our users was the ability to exchange data over the Internet. The code is part of a Mac OS X Cocoa app, so it has some Mac-specific code intermingled with the GData code. To bring it into an iPhone project, I trimmed out the Mac user interface stuff, and defined a class and a protocol to create code that should work from any Mac or iPhone application. You can download the source at Google Code, writes Tom.