I tend to only use the first option in the following situation

  $debug && print "Some debugging output.\n";
[download]

Works for me because I see the "$debug" and mentally disregard that line from the regular functionality of the code.

  print "Some debugging output.\n" if $debug;
[download]

...doesn't stand out as much as debugging because I tend to scan code down the left side.

   if ($debug) {
      print "Some debugging output.\n";
   }
[download]

...that way just eats up way too much room when there's a lot of debugging output.

And of course these are all for smaller scripts where a more complete debugging output solution isn't needed.

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