Glad someone found this of use.
A few months after this original post, I had problems getting a cron to work with PHPList ... again! Everything seemed to go along great for months and then ... pow. It all stopped.
I went on the hunt for a more user friendly mailing list app to send newsletters. Found poMMo, installed, set it up, imported the user list from PHPList and it works ... pretty much flawlessly. Seems one of the best things about it is that it doesn't require a cron command to run. Its open source. I like it a lot.
http://pommo.org/