For Arduino fans this is great news, now its possible to extend the functionality of the Diecimila board with ethernet shield. The board is built using the w5100 chip from Wiznet, so no need to implement the IP stack.
To connect to your LAN, all you need is to configure the MAC address, the IP and plug the cross cable into the RJ45.
There is offcourse available some demo application, with server/client possibility for easy startup.
This board offers the possibility to explore the TCP/IP networking with a simple and affordable hardware and free software tools.
Ethernet via Arduino: [Link]