I posted this on DPR as well, but figured some people here might be able to add their input...(summary is - my viewfinder was tilted, sent to Canon, my viewfinder is still tilted)...
I received my camera with a serial number 606xxx, and after shooting a number of landscapes, noticed the tilt in the viewfinder.
I took these shots to show the variation - there's a 0.8deg tilt:

I called Canon Irvine, they told me to bring the camera in. I dropped it off, and after 2.5 weeks (with no updates!), finally saw 'Completed' on the repair status page. I picked it up a couple days ago, and shot a new test image (lined up like the last one, but with grid paper and center crop. If people really want a through-the-viewfinder shot, I can do that too...but I was lazy at the time):

Canon didn't fix the problem! Instead of 0.8deg, it's between 0.5deg and 0.6deg.
What do I do now? It wasn't a particularly good feeling to not have the camera for over two weeks and miss out on shoots, and it doesn't appear as if Canon Irvine can even do the repair accurately. Is there anyone I can contact?