If your serious about photography and own a Nikon DSLR you might want to have a look at this project. It’s simple enough, he programmed a PIC microcontroller to fire off a series of pulses to an infrared LED that will trip the shutter of a Nikon D70 (should work with other Nikon cameras too, it emulates an ML-L3 remote). It’s a clever project, and easy one too.