I would like to introduce a new project on Crowdsuspply:
After proposing the 644/1284 Narrow I considered users might want an Uno form factor board implementing an Atmega644 or Atmega1284, but with some difference with the boards that might have existed. Nowadays many application require to be powered in 3.3V instead of 5V and some need more power.
This is why I choose to offer all the combinations of Atmega644/Atmega1284 in 3.3V or 5V or 5V with a DC/DC converter and a few open drain switches.
Let me know what you think about that!!