I mean something like these pages you can see what means rrdtool.
http://www.retorte.ch/tools/experiments_and_snippets/arduino_temperature_sensor/
http://solderlab.de/index.php/misc/sensors
I wish to use arduino to monitor wall temperature, sound level meter, and if it's possible wind meter, i wish to know what is better arduino usb or arduino ethernet?
Thanks
Jose