It's hard to imagine that something as simple as ordering a pizza delivery could be made even easier, but that's exactly the spirit of smartphones--modern convenience. Thanks to the young app Push for Pizza, your favorite local pizzeria will send a pepperoni-and-cheese to you, hot and ready, with merely one tap. The pie comes prepaid, including the driver's tip.
"The beauty of it, really, is that it's just one button, and that one button will bring you pizza," says Max Hellerstein, one of the app's five college-age co-founders, who here shares a few more indispensable apps.
"My business partner Cyrus is an avid bike rider. He...