This could be interesting - Webcam Zone Triggers

[ErikRuud]

I just found out about this:
http://www.zonetrigger.com/index.html

It originally came to my attention as an option to be used with a slot car timing program that I use.

After seeing this example, it could be an interesting way to add some controls to a cab.
http://www.zonetrigger.com/creative.html

I can also see using it to control portions of my halloween display.