Arduino shields are boards that will expand the functionalities of your Arduino. You just need to plug them over the top of the Arduino board.
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As of 9/20/2012 Adafruit is currently shipping R3 of the Arduino Uno Ethernet
Arduino Uno Ethernet
Arduino GIGA Display Shield
This Arduino compatible shield turns any old Arduino board to a nice clean Attiny programmer. It can handle Attiny 13/24/44/84/25/45/85.
All ATtiny Arduino programmer shield by SIKTEC on Tindie
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The MKR THERM Shield allows a board of the MKR family to acquire temperatures from a thermocouple of type K and a DS18Bxx digital one wire sensor. The
Arduino MKR Therm Shield
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25 Useful Arduino Shields That You Might Need to Get