My name is Yury, I'm from Russia. Sorry for my poor English.
I've made the similar project, but with difference, at first my stations are fully wireless, it meant it dosn't require PC, Internet, even AC power. It use solar cell for charging Li+ batt and GPRS for uploading data on MySQL base.
Additionally it logs temperature, humidity, air pressure and calculates dew point.
Currently only one station is works, you may find it here:
http://pripyachka.com/g.php?info&n=4 in charts and here:
http://pripyachka.com/t.php?info&n=4 in text
it's located near my home (~15 km to south from Moscow, a half way to DME airport)
Sorry, only in Russian is available right now.
Another two stations was located in Pripyat town (near Chernobyl NPP) in Ukraine, it's N6 and N10 (also N5 before), you may change last digit in website address to change station No. But it was stolen by marauders.
Each station contains 3 parts:
1) the base
2) weather sensor
3) security sensor
each part is wireless, contains RFM22 868MHz module
Weather sensor has BMP085 sensor for air pressure and SHT21 sensor for temperature and humidity, sends data every 15 min. It use LiFePo battery for power, one charge it's enough (I believe) for 2-3 years
Security sensor has photodiode, amp, mcu (mega88) and RFM22. Only the light hits the sensor, it starts to tranmit data within 6 min and base station listening for the data every 5 min. In alarm case base station will send SMS to my phone.
Base has SIM300DZ GRPS module (new one use SIM900D), RFM22, ATmega644P, HV source for GM and big one GM SI22G (СИ22Г). Battery is Li+ 18650 5p1s (one model has 24p1s, no need to charge it up to 20 months). It turns on receiver every 5 min for one sec, and every 1 hour it uploads the data to website. Right before uploading it turns on HV and counts radiation within 10 min.
I have plans to install the same stations in Pripyat, Chernobyl, Kiev, Minsk and a few in Moscow region and so.
More information you may find here: http://forum.pripyat.com/showthread.php?t=5217