Intertoobs. Intarwebs. Series of tubes. Whatever. Connect your Arduino / Freeduino SB to your LAN, WAN, or whole darn Internet!
Add ethernet connectivity to your project with the Wiznet WIZ811MJ module. Ready to go on a convenient board!
If you aren't familiar with the Electric Imp, it essentially provides an easy, integrated way to connect almost any hardware device both to other WiFi enabled devices and to internet services.
Netduino Plus 2 expands on the impressive 32-bit open source Netduino by adding ethernet connectivity and an SD card socket.
The Arduino Ethernet is a microcontroller board based on the Arduino Uno, and incorporating a WizNet W5100 TCP/IP Embedded Ethernet Controller.
Here's the official Arduino Ethernet Shield With PoE Module
Sometimes it would be very nice to be able to add connectivity to your Arduino/Freeduino project. The Adafruit Ethernet shield kit lets you add network connectivity!
This is a crucial piece if you want to connect your Arduino to the internets. This PCB can be used in conjunction with some headers, a few discrete components, and a WIZNET module to work as an Ethernet shield for an Arduino.