I believe that the name of mods hosted on wowi including plugins are distinct; no duplicates are possible.
http://wowinterface.com/mod/ModNameX
This would be a nice thing to link to other people 'hey check out my mod at this site'.
meanwhile on irc:
<@Cairenn> yeah, it's an interesting idea
( id`) this goes with the 'Web 2.0' generation of websites, where more thought is put in how to present your websites, and more attention is given to 'pretty links' instead of ID numbers