Sam Ruby: Canonical Reverse Or Wisdom Defying Shorturl?
http://intertwingly.net/blog/2009/04/14/Canonical-Reverse-Or-Wisdom-Defying-Shorturl
mnot’s Web log: Counting the ways that rev="canonical" hurts the Web
http://www.mnot.net/blog/2009/04/14/rev_canonical_bad
"That’s because while I was watching the kids rolling down the grass slope on top of Parliament House, rev="canonical" started to gain some serious momentum, billing itself as a way to shorten URLs that “doesn’t hurt the Internet.” In my opinion, this is an interesting idea with an very unfortunate execution that’s bad for the Web, and I’m going to enumerate the reasons here. "