Hi,
Latest example integrating DS18B20 Temperature sensor, DHT11 Temp/Humidity Sensor and Photoresistor Light level sensor.
Displayed on web here: https://ksduino.org/?devices&device_id=3330
Code here: http://arduino-info.wikispaces.com/ksduino-tests1
Later this will be a well-documented HowTo. Later.
Uses YourDuinoRobo1 (Duemilanove compatible), W5100 Ethernet shield, CAT5 cable, sensors etc..
Nothing done with routers, switches etc. Just plugged into network.