BOTW (http://botw.org/)
Business.com (http://www.business.com)
DMOZ (http://www.dmoz.org)
DMOZ Resource Zone (http://resource-zone.com/)
DMOZ submission guidelines (http://dmoz.org/add.html)
Gimpsy (http://www.gimpsy.com)
JoeAnt (http://www.joeant.com)
RubberStamped (http://www.rubberstamped.org)
Skaffe (http://www.skaffe.com)
Uncover the Net (http://www.uncoverthenet.com)
Web Beacon (http://www.web-beacon.com)
WoW Directory (http://www.wowdirectory.com)
Yahoo! Directory (http://www.dir.yahoo.com/)
Directories of Directories
Directory Archives (http://www.directoryarchives.com)
ISEDB (http://www.isedb.com/html/Web_Directories/)
Search Engine Guide
(http://www.searchengineguide.com/searchengines.html)

Some Notes

Apply to become an editor at JoeAnt, Skaffe, Web Beacon, and DMOZ in
categories that interest you. DMOZ will probably reject you. When you
do apply to DMOZ, try to apply for a small, ugly, and non-commercial
category (maybe a local one) and take your time filling out the application.