Yesterday I finally got the chance to play around with side view cameras, and while the video goes over most of the stuff, I thought it would be worth posting a few extra notes here on ecomodder.
Stuff I bought:
Car Rear Backup Camera Reverse Wide View Vision - eBay (item 110375394912 end time Apr-17-09 11:15:00 PDT)
New 7 Inch TFT Color Screen LCD Car Rear View Monitor - eBay (item 120404545582 end time Apr-17-09 09:15:00 PDT)
Was a solid $90 for all of that.
The camera is water proof and the screen can take two video inputs (two cameras) with switching via remote, so, decent deal. That's also a 7" camera for anyone wondering, so it's really easy to see.
There were really no stumbling blocks during the install, but you'll have to figure out for yourself on your car. The base for the camera was easy because I could easily disassemble the CRX mirrors into two pieces. If you can't you might need to cut a mirror in half for a good base.
Also, running the wires inside will prove to be tricky. I haven't done it yet because I'm lazy, but I will sooner or later and am not looking forward to it.