Some months ago, before the great restful reorganization patch (#1901), I created a small feature called project tinyurl.
This is a supersimple action that provides an unique permalink to a project path and redirects any request to the real project URL.
Here's a couple of real world examples:
I forked Eric's repos on GitHub and provided a full patch along with functional and integration tests.
All changes are available in a separate branch called
tinuyrl (ehm... I mispelled it on creation!).