• WIZnet Network Module Cheapest HW Ethernet board, looks tough to use though, $21.99

• Wiznet Serial to Ethernet $33.99

• Lantronix Xport $49.00, excellent device works great, but needs 3.3V.

• Xport Dongle to connect to RS-232 D-SUB 9 connector and contains 5V to 3.3V regulator

• Xport Direct $28

• EZ Web Lynx $49 has 10+ digi I/Os and 5+ analog inputs

Embedded Linux

• PicoTux Ethernet Jack Embedded Linux (99 Euros)

• NSLU2 NAS you can turn into embedded Linux machine, ~$80