Apparently no longer maintained, but of interest for historical reasons.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/
Usenet newsgroups listed by hierarchy, description, and by index. No newsserver access. Each newsgroup has its own page with statistics and links to FAQs and other group information. http://tile.net/news/
Organized by topic (using entire words, not the cryptic abbreviations like "soc" or "std" sometimes used in newsgroup names). http://www.harley.com/usenet/
Categorized lists of usenet groups and Yahoo groups (mailing lists). Links to google groups and Yahoo groups for web-based browsing of the groups. http://www.newsgroups-1.com/