Sure, there's a bigger version that will let you fire off shots from your DSLR in number of exotic ways (with sounds, lights and whatnot), but the dongle is more appealing if you're just looking for a small, tidy way of setting off your camera without you standing right behind it.
Keeping with the contextual phone skills, Samsung's Smart Stay feature makes the device detect (through the front-facing camera) whether a face is looking at it in order to switch the display on or off.