Nat, it really stinks that this is the second 20D that’s been taken from you. It’s an extremely long shot, but if you have the serial numbers, you might want to put something about each in the Photo.net stolen equipment registry.
Also, you might want to look into a “personal article” insurance policy for your camera (and other electronics) equipment, for the future. You should be able to find one that insures against breakage and loss (theft, accidently leaving it somewhere, etc.). It’s usually not too expensive (much cheaper than the camera equipment) if it is a personal policy. Again, Photo.net has some more info on the subject.
In addition, If you currently have renter’s insurance, you might want to check to see if it may actually cover the stolen equipment, even though it wasn’t stolen from your residence.