I printed several notices to leave the plates in the trunk and left one on the dash, seats, and trunk to make sure I didn't lose my ED plates. If you're contemplating ED, the "other bimmer" forum has a very informative ED forum and wiki that you should check out.
Here is the multilingual plate notice to leave in your car after you drop it off at the end of your trip.
http://www.bimmerfest.com/forums/att...0&d=1246935569