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 [...]

Some directories have recently been removed from Google’s cache, while others
are not crawled very deeply. Additionally, some of them have not had their cache
dates updated in a great deal of time. Google might be trying to slow the growth
of directories by not counting the links from many of them. Make sure you check
the cache before [...]

Business.com is a business directory that costs a couple hundred dollars annually to
list your site. In general, Business.com is a strong link that most businesses should
buy in on. Business.com and some other directories allow you to list multiple links
in your listing.
There are also many industry-specific directories you can find by searching for
terms such as “<my [...]