I would like to be the first or one of first people quoting it: RMAP project. It is a very interesting initiative for a network of environmental data agents. The acronym stays for Rete di Monitoraggio Ambientale Partecipativo (Environmental and Participated Monitoring Network).
RMAP provides a whole set of – absolutely open source – tools, from hardware sensors up to web server for data gathering and distributing.
I am sure you will hear again about it. For the meanwhile… stay in touch.