Newsgroup Directories

Cyberfiber: Newsgroups Listing
Browse or search this hierarchical topic list of Usenet newsgroups. Does not provide access to newsgroups.
http://www.cyberfiber.com/

Google Groups' Directory
Usenet newsgroups and Google Group mailing lists classified by topic, language, region and activity.
http://groups.google.com/groups/dir

Newsgroups-1
Categorized lists of Usenet newsgroups and Yahoo groups (mailing lists). Links to Google groups and Yahoo groups for web-based browsing of the groups.
http://www.newsgroups-1.com/

Newsgroups Related to Network Abuse
List of newsgroups related to network abuse. Includes a description of each newsgroup and a link to its charter. Maintained by Russ Albery.
http://www.eyrie.org/~eagle/faqs/nana-groups.html

Usenet Info Center Launch Pad
Apparently no longer maintained, but of interest for historical reasons. Besides a list of Usenet newsgroups, also contains links to FAQs, newsgroup descriptions, and other Usenet information.
http://www.ibiblio.org/usenet-i/