1. TubeSat: A DIY satellite
For a mere 35,000 or so you too can join the space race. The TubeSat Kit from Interorbital Systems includes everything you need to construct a satellite that can be received on the ground by a hand-held amateur radio receiver. The price also includes the cost of launch into self-decaying low earth orbit so the "bird" will last for several weeks before plummeting back into the atmosphere and burning up.