HippoRemote – This app is a bit different than the others on this list. It turns your iPhone into a Wi-Fi keyboard, trackpad, and remote controller for your Mac, PC or Linux computer. So, for instance, you can use it to click through a PowerPoint presentation you are giving. It supports over 60 apps as well as macros. ($4.99, Download) A Lite version (Free, Download) is available to try before you by. It, however, doesn't support a number of premium features, such as App Profiles, Auto App Switching, Login & Password, the aforementioned Macros, Pause on Call, Proximity Sensor, Integrated Web Browser, and Boxee/Plex/XBMC Gesture Pad.