Only for members I just uploaded a news version of the experimental Pop Up Module for Newsletter. It should fix some layout problem and the thank you message configuration.
That module is temporary active on this site just to show how it works and… to test it as well.
Pop Ups, even if hated, are a killer method to generate subscription or generally conversions. Of course it’s up to you to decide to use them.
The module is configurable to open the pop up on n-th page view and with a delay of x seconds.