This is a not terribly impressive and vaguely cute way to deal with the fact that $0 could be different lengths depending on how you call code (./foo, foo, /path/to/foo, etc...) I find it useful when writing usage statements that span multiple lines, allowing me to line up the code args properly underneath one another. It's kind of silly, but I need to start posting so I can start voting :) 
sub usage
{
  my $spaces = " " x ((length $0) + 7);
  print "Usage: $0 <some args....>\n";
  print $spaces . "<some more args>\n";
  exit;
}

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In reply to formatting usage statements with $0 by deorth

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