Google may not favor directory listings the same as in years past.
http://www.beussery.com/blog/index.php/2008/10/google-no-longer-suggests-directory-submission/

[Moved from "Google no longer promotes Yahoo directory" – Tony]

Google have stopped encouraging webmasters to submit their sites to paid directories such as Yahoo – for years Google told webmasters to do this practice in their Webmaster Guidelines but now this information has been removed.

http://www.google.com/support/webmasters/bin/answer.py?answer=35769&topic=15260

However, this change hasn't yet been reflected in non-US versions of the guidelines...

http://www.google.com/support/webmasters/bin/answer.py?hl=en-us&answer=35769

(From http://www.beussery.com/blog/index.php/2008/10/google-no-longer-suggests-directory-submission/)

I bet it still helps to have your page listed in DMOZ.