Everyone has seen those arm straps to hold your iPod, but a company called JAMinnovations also makes arm/wrist straps to hold your cell phone or smart phone. The straps will hold handsets of all different designs, from tiny flip phones to clunky candy-bar models. They even have a strap for Treos and other smart phones.
No doubt, having a cell phone on your morning jog would be convenient in an emergency, but otherwise the straps border on the land of "things you don't need" (at least in my opinion). And what's more, they just seem like they'd be uncomfortable. Straps like these were on sale at the information fair preceding the San Francisco Marathon this summer. Now that just seems really unnecessary.