Inspired by this thread I tore apart my Edge that I have had for under 2 weeks!! LOL
I went to RadioShack and snagged some green LEDs that have a built in resistor. 3 lights total. $1.99 each. To be safe I got a few other supplies such as wire and connectors and went to work.
I placed one LED in the tray where the power source is. Another one went in the cup holder and the last one went in the storage compartment. I had a switch laying around so I put it on the one in the storage compartment so it can only be on with the switch AND if the lights are on. That way even if I leave the light on it is only on with the lights.
Here are some pics of the supplies I used and the installed lights. I took some in the dark but you do not see much. They light enough to illuminate the areas that they are intended and no more. I did grab a 4th LED which I may add to the storage compartment but I can see chargers, i-pod, etc. just well with the one LED.
Thanks for all that posted pics and instructions here. They were most helpful!