Colin Reese blogged about his MEGA controller build:
Last we met, we built a prototype temperature wireless RF temperature controller. We got some good ideas and a Beer Fridge monitor out of the deal. We also realized, however, that we were flying pretty close to the sun in terms of the available memory we had to work with. Considering we weren’t concerned about power consumption, wanted to make our IO as flexible as possible (for example more interrupts and UARTs), we decided that a more powerful micro is in order. Enter the Moteino MEGA. Take a Moteino R4 and swap out the ATMEGA328P for a 1284P, add a reset button, and you get the Moteino MEGA. Fantastic idea. It’s a slightly larger footprint, but all progress has a price, right?
Details can be found on his Cupid Controls site.