For those who have to send the camera away for cleaning, how do you pack it? And then how do you ship it (UPS, FedEx, next day, etc)?
I've never shipped a camera to Canon, but I've loaned a 7D to a friend. Wrap it in bubble wrap, then place that in a box large enough for a few inches of packing material on all sides. If sending to Canon, do not include anything but the camera (no battery, no strap, etc.), ship it with the body cap installed.
Ship UPS or FedEx so you can get a tracking number that means something (USPS reports delivery, but does not actually track regular shipments). Enter the proper declared value and pay the insurance.
Probably a little late here, but it is worth mentioning that all of the freight companies have packaging guidelines.
If these packaging guidelines are not followed, the freight companies will not pay out on the insurance that you paid for in the event of damage. Actual loss is different if the package is not recovered. I have received "improperly packaged" damaged freight that was insured (and coverage refused) and have had packages outright disappear from UPS (only once, but I would have been SOL if I didn't insist on insurance from the shipper, and the investigation took a month).
If you do not have a shipping account, insurance gets expensive pretty quickly. In my experience, the local shipping depots in the strip malls mark up insurance rates 2x over doing it yourself online (which are still overly expensive retail rates), as long as the coverage limit isn't reached. UPS, USPS and FedEx all have insurance limits for online transactions and UPS has additional forms that must be filled out by a UPS employee once a certain threshold is reached (route driver or UPS depot- the strip mall centers don't count).
The replacement value of a 5DIII and a 70-200 II lens can come close to the insurance limits for retail customers.
Big companies shipping expensive stuff may not insure the packages- they have separate insurance to cover loss and the cost of shipping is exceeded by the cost of the carrier insurance rates.
For those that ship camera stuff regularly, it may be worthwhile checking into a shipping rider for your insurance.