Catalist, the catalog of listserv lists
Frequently updated database of over 11,000 listservs. Offers a variety of ways to search for mailing lists: country, number of subscribers, host site or host country, and title. Also offers keyword searching of list names and sites.
Search news groups by keyword or browse by specific topic.
Directory of Internet discussion groups arranged alphabetically by description of list, name of list, subject, host country, and sponsoring organization.
Directory of Internet newsletters and discussions arranged by topic.