Just out of curiosity, why is there a notch on the corner of the Arduino boards opposite the USB connector (upper right if you're looking down on the board with the USB connector at the upper left)?
On the Mega, it means that the pin numbers for digital 23-29 are not printed on the board, which is why I noticed it at all.
I suspect it is just styling. 
I suspect it is just styling.
Yea, must be an Italian thing.
Lefty
non posso imaginare che รจ soltanto una cosa italiano?
sospetto che c'era un motivo specifico e tecnico al inizio del progetto.
Well Yahoo Bable Fish translates that too:
"I cannot imaginare that it is only an Italian thing? suspicion that c' it was a specific and technical reason to the beginning of the plan. "
Yea, right, kind of like the odd pin spacing used between the two digital pin connectors. 
Lefty
Pretty close. 2nd sentence is "I suspect there was a specific technical reason at the start of the project."
Funny how small things have a way of getting perpetuated and are not easily changed later. Now shields all follow that design.