Arduino shield with a plethora of ZIF sockets to allow programming of all the various Atmel AVR chips.
The hardware directory should contain the Eagle CAD project files needed to build the board. Since they're Not Exactly Code but still open hardware, I'm licensing them under Creative Commons Attribution Share Alike license.
I've modified the sample code provided with the Arduino distribution for the firmware files, both because I needed to ensure all the pins would line up and also do fix a few problems/lack of clarity in the source code Sicne this was originally under a 2-clause BSD license, I will stick to that for my fork of the code.