Instructables user Mikeasaurus used household items— including thumbtacks and a Bic pen— to make a remotely-triggered rig for his kite, compatible with any camera. Well, any camera he felt comfortable dangling off a kite.
As much as we love complicated, Arduino-based wonders of homemade coding, sometimes it's nice to see a simple, MacGuyvered mechanical creation. We're not sure anyone would want to make exactly this example, but check out the guide, it'll give you an idea how he made it. [Instructables via Lifehacker]