I believe this has been discussed before on this forum, but can't seem to find the thread right now.
Anyway, if you Google "Canon Loyalty Program" you'll find several references to it. Most lead back to a thread on FatWallet.com, I believe. I haven't used the program, but from what I understand, you can trade in a dead Canon camera for a refurbished model at a significant discount.
The models available vary. At one time the 5DII was available, but may not be any more. You have to call the number listed in the discussion boards directly for pricing, availability and rules.