CataList
From this page, you can browse any of the 13,617 public LISTSERV lists on the Internet,
search for mailing lists of interest, and get information about LISTSERV host sites.
E-Mail Discussion Groups/Lists - Resources
This page is intended as a one-stop information resource about e-mail discussion groups or
"lists," as they are sometimes called.
Liszt
The premier directory of publicly accessible mailing lists, a collection of 71,618 mailing
lists.
Publicly Accessible Mailing Lists
A listing of mailing lists that is searchable or can be looked up alphabetically.
Reference.Com
This is another good mailing lists, that is searchable and browsable.
The List of Lists
This is one of the directories of special interest group e-mail lists available on the
Internet.
tile.net/listserv
The Comprehensive Internet Reference to Discussion Lists.