Canon still has my camera. Of the 7 months I've owned it, it has been at Canon getting serviced for over 3 of those months.
The latest word is that they can't find anything wrong with it despite it having repeatedly locked up during the last shoot I did with it on a completely dry day. It hadn't been anywhere near water since the last repair - as a matter of fact it hadn't been used at all since the last repair. I've now sent in the flash, lens and card I used, along with the corrupted images it wrote out during that shoot. I tried the same lens, flash and card on my wife's 5D2 and they worked fine there, so it doesn't appear to be related to one of those components.
Even if they do fix it again, I don't really have much confidence it isn't going to fail again and have to spend another month or two getting fixed again.
For a camera that claims "improved weather sealing" it appears it is awfully susceptible to water damage. I've used my original 5D in the same conditions and haven't had any problems. Canon's response to me is "It isn't a professional camera, you should be using a 1 series in those conditions". I'm beginning to think I should be using a Nikon.
Martin