We have multiple lists for people to sign up. When a user signs up to a second list, their name is removed from the first list, and they receive a "Thank you for your Change in Interests" automated message from Constant Contact.
Each list requests slightly different information, so we must have separate forms for each.
We need users to be able to sign up on multiple lists, just not using a single form.
Otherwise, this is a great plugin! It was really easy to configure and get working.