Optiboot is a bootloader that was made for mega168-328 that is a quarter in size of the original Arduino bootloader and supports fast baud rates. As soon as the new Arduino IDE version is released that includes the latest Avrdude, non standard baud rates may be used (it already works on MAC at 230400 baud). They are working to make it compatible with mega1280 that Arduino Mega uses, so it will be soon Axon compatible.