http://www.dejanews.com/
This newly improved collection of indexed Usenet news articles sometimes trails the records in Excite and Alta Vista, but it's still the popular standard.

http://www.liszt.com/
Don't get enough engaging email? Find your area of interest in this the largest collection of listserv, listproc, majordomo, and independently managed mailing lists on the Web.

http://tile.net/news/
Trying to find the Usenet newsgroup that's right for you? Tile.Net's index includes group statistics and links to FAQs.

http://www.cis.ohio-state.edu/hypertext/faq/usenet/FAQ-List.html
Want to find the FAQ for a particular newsgroup? Check Infoseek first, and if you strike out there, try this limited search on newsgroup names, archive names, subjects, and keywords.

http://awebs.com/news_archive/
Search American Web Services' archives of almost 30 Web-related newsgroups.

http://www.infoseek.com/
Infoseek's Usenet collection includes not only newsgroup articles and threads, but also a handy FAQ primer for Usenet in general and many newsgroups in particular.

http://tile.net/listserv/
Tile.Net's large Internet discussion-group reference includes group statistics, information, and mail links for joining groups.

http://www.hotbot.com/
HotWired adds this Inktomi-based Internet search tool to its collection of hip tools for netizens. Advanced searches don't require any fancy search syntax. Just pick from their menu in plain English!