The script is here, but I figured I'd start a discussion about it too since there doesn't seem to be a way to comment on wiki pages on g.d.o.
Anyway, I recently updated the script, fixing the patterns (regular expressions) a bit and making it so redirects return an HTTP status code of 301 instead of 302, to more closely match the behavior of Drupal's .htaccess file. If you're already using the script, updating it isn't strictly necessary, but it shouldn't hurt.