I am about to switch to a Linux server, so my ASP based mailing list will no longer work. Any sugestions on a new Perl based mailing list software or script I should try??? Thanks!

Check out 1-2-All from Active Campaign. The software uses PHP and MySQL. It has a ton of features and is relatively easy to install.

1-2-All Mail (http://www.activecampaign.com/12all/)

The most popular and widely used mailing list is Mailman.
Its available at list.org

Also check out Majordomo which is very popular..and free

http://www.greatcircle.com/majordomo/

Bob