LMD18200 (55 V 3 A h-bridge, for driving motors, for example. includes current sensing and thermal shutdown.)
LMD18245 (55 V 3 A current-controlled h-bridge, for driving motors at set currents?)
PIC16F84 (cheap flash-programmable microprocessor with 13 I/O lines)
PIC16F876 (cheap flash-programmable microprpcessor with 10-bit A/D, hardware UART, 10-bit PWM, etc...)
MAX220-249 (5V to 12V level converters, for serial communication between a PC and a PIC, for example)
AN-694, an application note about the LMD18200. More details of how the chip works and how to use it.
LM12CL 80W op-amp (includes examples of high-power voltage-to-current amps for servo drives)