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Halogen to LED conversion

Replacing a 50 watt Halogen lamp with ~6 watts of LEDs and a small fan. More images here.
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Li-Ion Battery +5 volt supply

A simple boost-mode converter supplying up to 1 Amp at 5 volts from a CR123A cell with battery level readout and low-voltage shutdown. More images + download schematics and code here.
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Color Kinetics Fixture DMX Driver

A simple circuit to take a DMX stream and translate the signal levels to drive the original Color Kinetics iColor Cover RGB Fixtures. More images and schematic here.
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Esquire 75th Anniversary Cover Hack

My entry in Esquire's E-ink cover hacking challenge. More info here.