I have recently joined the "post anything and everything on YouTube" bandwagon. Last March I had a 3+ hr layover in DTW. Aside from exploring the lenghty McNamera Terminal (Northwest), I took a couple video clips from the overhead ExpressTram which gets you across the mile-long terminal.

http://www.youtube.com/watch?v=dBUKl1OYU6U

Sorry about the quality; still exploring the best compression options for YouTube posting. Actual quality is much better....