Articles about cars:
Installation of Webasto Thermo Top Evo heater in Mercedes-Benz W124
Detailed writeup of installation of Webasto Thermo Top Evo auxiliary heater in '94 MB W124. Contains some quirks like using W-BUS emulator and fooling the heater to use already-present circulation pump instead of separate one.
Car radio shutoff delay
A simple circuit to keep the radio on for a few seconds after the ignition is turned off. This prevents the radio from shutting down when you want to restart the car.