Directories

Best Web Directories
Rankings and reviews of free and paid web directories. Manual submission service available.
http://www.best-web-directories.com/

Directory List
List of Internet directories to aid website owners in the submission process.
http://www.directorylist.org/

Info Vilesilencer
Provides a large list of SEO-friendly general and niche directories. There are also forums to discuss directories.
http://info.vilesilencer.com/

Ranking Directories
Listing web directories by category and by fees charged for inclusion.
http://www.rankingdirectories.com/

Site Vortex
A non-commercial site offering a catalogue of search engines and directories for webmasters.
http://www.geocities.com/site_vortex/

Whitelines.net
Offers a front-end to the most important international search engines for targeted web search and manual URL submission.
http://www.whitelines.net/