I like the security system recommendations. Given that you're here on APS stuff like that's probably already somewhat of a topic you're familiar with so it seems like a logical step. Also, I agree with MrsSmith in that it would be an honorable venture. Not that the others aren't. Well, except for the stripper/escort stuff.
Another thought on that line of thinking is small store camera systems. Raise your hand if you've seen grainy black and white "video" with a frame taken every 4 seconds on the news from a robbery.
Those things are pretty much worthless, especially contrasted with what you can pull off today for not much in hardware. Cameras today are awesome, computers are cheap, storage is cheap, etc. Rough guess but I bet you could put in a 2 camera system capturing 720p quality video at 24fps for right around a grand these days in hardware costs. You could charge some fairly good money for putting something like that in and your electrical experience would probably help with running (or just working with existing) coax cables.
I only suggest it because I'm going to be doing this myself in the near future, and we're doing it ourself because, generally, people that want to sell you this charge WAY too much.
