I have a video system which allows me to view the cameras and playback remotely. I also acquired a weather station that allows me to access the outside temperature, humidity, and wind speed -- and the inside temperature and humidity remotely via the internet. I can't remember what I paid for the weather station -- but it was less than $100. It also ties in to NOAA to give a quick weather forecast on the screen.
I always, of course turn off the water, either in the house or at the meter, turn off the water heater, turn off the water softener etc.