Eureka!

[Skip Montanaro]

    Tim> I really like tiny urls (and successfully argued with IT here that
    Tim> they should not be blocked as they are only a redirector). However,
    Tim> I prefer that people (including myself) include both the original
    Tim> URL (which may wrap) and the tiny url in the post.

    Tim> That way people can have much greater confidence in the page that
    Tim> they are going to be redirected to. It's not foolproof, but it's
    Tim> better IMO.

Much greater?

    http://tinyurl.com/161
    http://manatee.mojam.com/~skip/

If someone is out to deceive you, having them post two URLs isn't going to
deter them. ;-)

Skip