Here's a secret they didn't tell you when you bought a 3G iPhone: One of its best features—the ability to run new applications found on iTunes—is also possible on the old iPhone with an easy software upgrade. Plus, you can hack your first-gen to run unofficial apps alongside the sanctioned ones (known as "jailbreaking" the phone). And remember that your deactivated iPhone still has built-in Wi-Fi and Bluetooth as well. With all this at your disposal, there are lots of ways to give a first-gen a second life.
Apple's free Remote application is the slickest way to control your AppleTV or Mac's iTunes with an iPhone, but there are other free apps for controlling your TiVo (code.google.com/p/tivoremote), your MythTV home-theater PC (trac2.assembla.com/mymote/wiki) or any computer (code.google.com/p/telekinesis).
Turn the page to see how to turn it into a GPS device.