I wrote my own weather station software based on the 1 wire network SDK and hardware from AAG and from Hobby Boards.
Inspeed Anemometer
Hobby Boards Humidity/Temp
AAG Barometer

The programs are Windows console applications written in C/C++. The application used to be one big applcation doing the weather sensor reads, the web updates and the scheduling. I have since broken out the big program into the individual programs and schedule the running of the applications via Scheduled Tasks timers.
The data from this server is deposited into a PostgreSQL database .

The UI to the data is through XML and XSL pages. 1 wire weather server UI

The data is also sent to the National Weather Service MADIS system

And to Weather Underground.
Click for Wellesley, Massachusetts Forecast

NWS - Boston

NWS - Long Island