Thanks for a great plugin.
Thought there are one thing in particular that I am missing.
An option to also register for the actual site and not only the newsletter.
That way people dont have to go through the process of signing up for the site if they just started out as newsletter subscribers.
Because when you are able to allign WP-users with the newsletter, vice versa should also be possible and then they should either(if they choose) on newsletter signup be asked for a username and password, or it should be created automaticly.