mailing list program?

[nidea.livejournal.com]

I'd like to set up a semi-automated mailing list subscription thingy (opt-in with email confirmation), and I was wondering what you like to use! I've seen some PHP forms I liked, while signing up for the HHG, and might go with that... I can install things on my server, and I want something where I can customize the look myself (I know html so that's not a problem).

Then I just need to think of something to write about. :)