It seems a shame to run down the battery of an iPhone by making phone calls. There are so many more interesting things to do with it since July, when Apple Inc. opened up the popular smartphone to outside software developers.
Stacks is an add-on for jailbroken, or hacked, iPhones which brings a distinctly Mac-like tweak to the iPhone UI. As the video shows, Stacks lets you replace the icons in the home row (the non-moving row of icons at the bottom of the screen) with, well, stacks.