I'm sitting in the lovely Denver airport, where I've been for a while. During my dinner, I looked out the window, and saw some of the best marketing I've ever encountered -- an American Airlines pilot inspecting his plane before entering the cockpit and taking off.
As I sat there chewing on my dinner, this guy walked VERY slowly around the entire plane, stopping to get a closer look at things like the landing gear, engines and so on. I'm not sure if he was required to do this or just did it on his own, but the impression it created was strong -- this was a pilot, and an airline, that was professional, thorough, and was really concerned with doing things correctly.
The moral here for marketers is that it's not a bad idea, from time to time, to not only show your clients what you do, but how you do it.