that would be here: http://www.ebay.com/itm/Arduino-Mega-Sensor-Shield-V4-digital-analog-module-/190581394447?pt=LH_DefaultDomain_0&hash=item2c5f894c0f
I will try to connect it directly to the duemilanove...to check if it's working, serial monitor should do it?
Thank you for your help!