Well, I don't really understand this pin 53 business. On top of this, see that instead of the standard pins 10, 11, 12, 13 on my shield pins 3, 5, 6, 9, 10 and 11 are marked? I really seem to first need the schematics of this shield, don't you think? Or maybe I should return this shield and rather ask for exactly the V5 as documented at http://arduino.cc/en/Main/ArduinoEthernetShield?