Subcategories:
- Article and Reference Directories @ (9)
- Bookmark Managers (2)
- Business Directories (22)
- Deep Linking (6)
- Directories of Directories (13)
- General Directories (150)
- Niche Directories (43)
- Pay Per Click (1)
- Regional Directories (0)
Directories 
1. 2.0 Websites
Directory featuring Web 2.0 websites.
http://2.0websites.com/
Lists of sites in different categories, professionally edited and maintained by humans. Accepts free, paid express review, and paid sponsored listing submissions.
http://www.hedir.com/
3. JoeAnt 
A volunteer-edited general directory of quality Web sites founded by former Go.com editors. Listings include editor rating, content hints, a site preview, and the Alexa traffic graph.
http://www.joeant.com/
4. Web-Beacon 
A family-friendly, spam-free internet directory, searchable by category or keywords. Free submissions for volunteer editors.
http://www.web-beacon.com/
Directory organized by subject, including Web Directories.