Think I found a bug. After I received the "All set!" email I got this message when trying to create a list: "Please reply to the confirmation email we sent you. Only verified email accounts can create a list. "
So, I'm basically unable to test the full application. But I loved what I've seen so far. More people should use minimalistic interfaces like this for their applications.
Sending a link in an email is definitely in my tracker as a feature to be added. Thanks for checking it out.