How many people care enough about displaying cleaner urls to bother doing anything about this? And if you do, what do you do?

Myself the idea of hiding a ".pl" extension on a URL gets a non-committal "meh."

If I were really interested in doing that I supposed I could symlink to a filename devoid of the .pl but that might not work depending on how the server is configured. (I'll have to try that later.)

I see plenty of other examples of "unclean URLs" such as the Wall Street Journal's website and others...