The SPI data pins on the newer ethernet shield is on the ICSP connector. Connect digital pin 10 on the Uno to digital 10 on the shield, but pins 11-13 on the Uno (or the ICSP pins on the Uno) must be connected to the appropriate pins on the ethernet shield ICSP connector.Digital pins 11-13 on the shield are not connected to the w5100 or the SD.
Ist not on your Uno curently but http://arduino.cc/en/Main/ArduinoBoardUno you can see it on here
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via Egeo 16