Electronics

Microchip

 18F4580
 18F2685
 dsPIC33FJ128MC802

Ultrasonic sensors

 Maxbotix documentations

Bluetooth <-> RS232

 BlueSMiRF Gold

USB <-> RS232

 Z-Tek USB to RS232 A good converter USB/RS232 for all OS (Windows, Linux and MacOS X)

Mecanics

Servos

 http://www.teaser.fr/~osegouin/aeromode/servos.phtml
 http://www.servocity.com/