Google. Need I say more? Okay, I will. This app is one of the few that gets regular use on my iPhone. It’s voice activated, how cool is that? You launch the application and then hold the phone up to your ear and tell it what you’re looking for. It’s also hooked into the phone’s GPS so, as shown in the example below, you can simply say something like “movie showtimes” and it will tell you the show times for your local theater. Not to mention currency conversion, weather, and more. I would highly recommend Google Mobile App.