In the Mid 80's Wim van Eck was able to recreate the display from another computer at over 100 yards with $15 - $20 in electronic parts and an old television. I remember reading about it a little in the early 90's and wanting to experiment with it, but I was never able to find enough free information on it to create anything that would work.
This thread got me a little interested in the topic again. I was under the same impression as others that modern day flat screen monitors wouldn't be susceptible to this. However, after a little research it seems like there might still be some potential to achieve this from some emanations coming from the cables.
Regardless, interesting thread... Thanks for the good read.