That's great! I only picked up one at the store, but I did get a similar Temperature/Humidity sensor. I figured once I got it to work I'd go buy some more, but then I broke my leg and I'm stuck in wheel chair for a few weeks at least
What type of project are you working on?
A few years ago I built a house with hydronic heating (hot water in the floor) and I want to accomplish a few things with my project:
1) Remotely monitor/alarm room temperatures and the function of the geothermal system
2) Better control the 'zoning' so I don't waste energy over heating rooms.
I figure an Arduino with an Ethernet shield, some temperature sensors, and an I/O board (opto triacs and opto isolators) should do it.