Great read. I have just bought the 7D and have been reading all the "7D is Crap" postings to learn as much as possible about potential user errors, and then read this.
Maybe the Nay Sayers should start here, instead of hasty posts about how bad the camera is.
Mine is a number of 30sec exposures trying to capture the milky way, when I got my first DSLR a number of years ago (400D). I looked through the view finder and everything is dark - must be right, it is dark. Check the LCD, no stars, bump up ISO, reset aperture, try again - still no luck. After the 4th go, I figure there is something wrong with the camera, so I head inside to find the problem..........