thank you for your response.
*just to be clear, I am talking about the Arduino Due
not about the Arduino Duemilanove
(which was replaced by the Uno)*
At the WiFi Shield's description ( http://arduino.cc/en/Main/ArduinoWiFiShield
) it's specified that "...It is compatible with the Arduino Uno and Mega." but there is no mention of the Due or any other board, so I've figured...
You are right, the description of the shield does not indicate it is compatible with Due/3.3V, but in fact it is. It has a level translator already for 5V/3.3V signals.
In addition, the operating voltage of the shield is 5v and the Due supplies only 3.3v (which I believe can be fixed by transistors but still need to be considered).
here you are confusing several things, to clarify:
1) the Due supplies both 3.3V and 5V power
2) a shield can be *powered from* 5V but still be compatible with 3.3V baseboard (or vice versa)
3) it is the IO signals that require level translation, this does not relate to power supplies
In short, the wi-fi sheld will work fine with the Due, do not worry!