ezmlm won't work because there is no way I could find to add what is missing.
Most people will give their name and email to get a free report or subscribe to a newsletter. I am not interested in those still living in the 90's and think they actually still have privacy ;)
For any list program to be useful, it needs to be double opt-in and needs an EASY way to unsubscribe. Autoresponders (as in sending multiple, timed email) are also a requirement for anyone doing serious business on the web today.
aweber.com is an example of a complete, easy to use system. marketerschoice.com also has autoresponders.
I don't think acs-mail is worthwhile because it was created for one thing, sending out messages and not managing subscribers that are not community members. I don't necessarily want every person on an email list as community members.