This is a great value Ethernet shield for your Arduino Uno, Mega and other 5V Arduino-compatible boards. It uses the standard Wiznet W5100 Ethernet controller and works perfectly with the standard Arduino Ethernet library.
The SPI/ICSP pins are brought down with a socket on the bottom, so you can use this with Arduino Mega and Leonardo boards as well. Also includes a microSD card socket.
It's really good value and we give you a full 12 month Tronixlabs hardware warranty - so why pay more anywhere else?
Check out the great Arduino and Ethernet tutorial