"@wayne garris, I just spend some time looking through the SAM3A datasheet that the DUE uses.  There appears to be no 5V tolerant inputs.  The chipKIT PIC32's however have almost all pins 5V tolerent."

"@Dan Overholt, it appears that the new DUE IDE actually is the chipKIT MPIDE (minus chipKIT), not by an upstream push by the chipKIT team, but rather a pull by the DUE team to take advantage of the awesome functionally created by Mark Sproul and…"

" The DUE is nice, but still not as powerful as the Arduino compatible chipKIT Max32 or the PONTECH UAV100 which is also based on the Ardunio compatible chipKIT platform.

Jacob"