My driveway one is monitored using motion, its a great bit of software for monitoring. I also use motion for the snapshots from the webcam on my roof. Its a cheap webcam from Jaycar thats designed for inside however I have had it outside for months now without a single issue.
Next thing I want to get is one of these. http://www.sheepwalkelectronics.co.uk/product_info.php?products_id=67&osCsid=95ea194c4a5014837e4387a6fd99345d
Its a one wire unit so I can add more sensors to the weather station.