Thanks for the tip. I was aware I could always swap Atmega chips, but frankly that seems like more work then it's worth each time I want to update the code- shouldn't be that often, but I guess I'm at the point in this project that if it's worth doing, then it's worth over doing! I'm actually hoping to design my own PCB's (one for the receiver & transmitter) and either etch it myself or have them done via something like BatchPCB. That's a little bit farther down the road I guess though... I still need to figure out a good way to power both ends since I don't want to use a wall wart.