Do you like to remotely trigger your camera? Do you also like iPhones? Enter Satechi's BT Smart Trigger. For $44.99, this little guy will happily trigger your camera's shutter via Bluetooth. It also works as an intervalometer, meaning you can time lapse with the greatest of ease...in between Angry Birds Star Wars. At the moment it only works for iPhones and Canon DSLRs, although they are planning to add compatibility with the Galaxy SIII and the Galaxy Note 2.
The camera trigger connects to said camera via USB and rests on the hotshoe adapter. The battery life is said to last up to 10 years, and it has a range of about 50 feet per the Bluetooth 4.0. The app has both a basic shooting mode, a "Manual Shot" mode where one can take long exposures and a "Time Shot" mode where one can capture time-lapses.
Of course, Canon's official remote app (coupled with a 6D and WiFi radio) can deliver a live feed of the camera's viewfinder right to your phone. The Satechi BT Smart Trigger, however, is much cheaper.