This could be very usefull to other 5D owners!
I sent my 5D back to Samy's Camera, and had them cross-ship me a new one.
When I received the new camera, the first thing I did was the dead pixel test, and I found 3 bright red pixels glowing nastily at me. Obviously I was upset! I started goggling for information on dead pixels on the 5d, so see if this was a common problem, and I found out that it was. Many people were complaining that it took them 3 or 4 cameras to actually find one without dead pixels.
I was not ready to sent the camera back to get it swapped out again, so I started searching for more information. What I found was real cool:
I came across a post on some camera geek board, that told me to do this:
Remove the lens from the camera, and cap the body.
Put the camera in the sensor cleaning mode for 30 seconds.
Shut off the camera for 30 seconds.
Do the dead pixel test again.
It worked! It seems that when you do the sensor cleaning on the 5D it maps the dead pixels automatically.
BTW: The way I test for dead pixels it to take a picture with the lens cap and the view finder cap on at iso100 for 1 second. The pixels show up nice and bright on a black background.