I suspect you're talking about all electronic mailing lists, regardless of the hosting software used. (LISTSERV is one of many.) However, I'm not sure how you'd get information on mailing lists hosted by other software, so I'll concentrate on LISTSERV-based mailing lists for this answer. The easiest way is probably to go to http://www.lsoft.com/lists/listref.html and do some searches. I did this and found 35 sites ending in .SE; presumably each hosts multiple mailing lists. I hope that this information is useful to you. -jwgh