Onboard 35mm Camera System
Onboard 2.4GHz Video System
Flight Data Recorders

event controllers, launch detection, apogee detection, magnetic orientation sensors, accelerometers, barometers, timers, etc.

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What if a rocket inflated a huge brightly-colored ball after it landed so it could be seen from a distance and in tall grass, etc?



John Coker offers a good comparison of several popular commercial altimeters and accelerometers.

Also from John Coker, suggestions for improved launch controller designs and breif reviews of several commercial products.

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Other homebrew designs:

Tony Brock-Fisher has a barometer based altimeter.

Robert DeHate has a number of homebrew electronics projects including a great flight computer.