Do you have any update on this? I also recently built a metaboard and successfully bootloaded both a ATmega328 and a ATmega328P but was not able to upload a sketch. I got some help on AVRfreakshttp://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=116456
Its kinda weird that there is so little information on the metaboard design. It is much cheaper than any other arduino and can work as a HID device. Does anyone know why this hasnt had more widespread use or why the information on it hasn't been kept up to date? Most of the information I find on it is from 2010 or older. That is a long time in arduino years.