Maniac:
Well this is an amusing coincidence...
http://www.kickstarter.com/projects/shawnswift/the-mightytm-microcontroller
It appears we chose similar names for our boards. Mine isn't really an Arduino variant though, it's designed to be programmed in basic via the SD card, with either a custom bootloader doing the work of compiling the code or an interpreter, either being uploaded via ISP.
I'm curious... why did you create your own setup rather than using the Sanguino's? Does it not work with the 1284P period, or does it just not work when doing a serial upload using a bootloader? And I think you mentioned changing your analog pin mapping to match the Leonardo... Is theirs backwards? Is it the opposite of the Sanguino?
I haven't decided what I'll do with the analog pins yet. Before I decided to upgrade my design tot he 644P or 1284P, I had the analog pins and digital pins backwards so that the analog pins would start at pin 1, because it's less confusing if the analog pin indexes match up with the digital ones.