Sometimes we forget what the real purpose of all this fancy technology is. And what is that? To make our real lives easier. Mashups often help with that, allowing us to do such simple things as find a good beer, our favorite music artists, where the streetcars are, or where a park is.
There is something to be said for simplicity, especially when it comes to applications that leverage web APIs for mobile devices. Enter Sparrow, an application for the iPhone, that serves as a good example of how a few web APIs can be elegantly implemented for use on a mobile device.