I like -s. It lets me do things like:

#!/usr/bin/perl -ws

use strict;
our ($name, $age, $sex);

# ...
[download]

and run the code like: prog.pl -name="Jeff Pinyan" -sex=male -age=19. I even got 10 characters or so added to Perl's source code to allow double-hyphens (if you're into that sort of thing).

japhy -- Perl and Regex Hacker