Ha! I got the same one for Christmas (the best present of the year!) They are really cool! The wind direction and barometer are super neat features. I took the anemometer apart when it fell off it's post and looked at the workings. The windspeed and rain gauge look like simple arduino boards. I haven't taken the other stuff apart- yet!
I am concerned they will degrade in the sun up there, but the nifty factor has convinced me to try to make metal ones when they go kaput, using the same circuit boards in new housings. The price per month has kept me from using the data package they offer. Eventually I am going to get around to running a packet sniffer (Paul will know what I'm talking about) to decode the data transfer over Wifi and allow me to dump it into a usable format for my (nonexistent) website. I will try to snoop around
online and see if someone has already done it, I bet they have...
EDIT- apparently not a new idea and a little more complicated than I thought. Here
are some links. The last one is related to the arduino programming. Super cool.