The Sanguino is an extension of the popular Arduino board designed and developed by Zach Hoeken et.al. for the RepRap Research Foundation.
Word Press Blog
Burning the Sanguino Bootloader using DAPA
Note: this isn’t limited to the Sanguino, but works on all ATmega (and probably ATtiny) based electronics.
Installing the bootloader on an ATmega644 or ATmega644P via Direct AVR Parallel Access (DAPA)