I've implemented this rev="canonical" idea on
  http://free.naplesplus.us in the hopes that it catches on
  further. It wasn't hard to put together. I followed the style
  used on php.net like so:
  http://free.naplesplus.us/articles/view.php/50574/colcourt is
  the original and in the header, I have: <link rev="canonical"
  rel="self alternate shorter shorturl shortlink"
  href="http://free.naplesplus.us/go.php/colcourt" /> which is the
  form used on php.net, which I happen to like, as it takes into
  account not only the rev=canonical, but ALSO the rel= self, or
  alternate or shorter or shorturl or shortlink ideas, which are
  ALSO excellent notions. If I wanted to go further, I will
  probably do a mod-rewrite to make the go.php into go But I
  figured since I had this GREAT nick-name system already in place
  that I was hardly taking any advantage of on my CMS (YACS - a
  little known system out of france), I might as well use it. It's
  not MUCH shorter (maybe 5-10 characters shorter at best - and
  some of them end up being LONGER) - but I figure that it's a
  beginning of a great idea! Ken Udut of Naples Florida