As a bit of an IT geek i can help a little!
So, you can get webcams that have all the gubbins in them to stream what it sees over the internet. We have them at work and they are quite good. Prob is though, you obv need 240V power for it to run, and an internet connection to plug it into, or wireless nearby if the webcam supports that.
The commercial route link that mike posted solves both the issues being solar powered and using 3G/GPRS to transmit the images. Prob is, the unit is probably expensive, and so is 3G transmissions!