[dcb]

The preassembled does not use a bootloader anymore for reliability and space reasons. You can reprogram it, because it is just an atmega168 chip in a pdip socket, if you want to get fancy, but the preassembleds mission (and mine) is simple and reliable fuel consumption feedback. You can swap chips with a pdip arduino or use an ISP programmer and adapter. I have a special adapter I made that just pushes onto the chip sitting in the socket and program it with a usbtinyisp. many many many options there, but not something I can support en masse.

I have been offering to reflash for six months from receipt provided the users pay shipping both ways (i.e. S.A.S.E.).

avrfreaks.net is a good resource as well if you want to learn more about isp programming.