Wii Nunchuk Remote Shutter Release
To go with the shiny new DSLR I got for Christmas, I turned a knockoff Wii nunchuk that I had kicking around in my parts drawer into a remote shutter release. I took some telephone wire (any 3 or more conductor wire will work) and wired it up to a Radio Shack 2.5mm plug. Then I fed it through a hole I made in the rubber strain relief of the nunchuk and soldered it to where the shoulder button board connected to the main board, then cut the traces leading from the connector. C auto-adjusts, and Z fires the shutter.