I did a quick hack (at a clients request) to allow for after signing up for a newsletter to redirect the person to another site. But they wanted this to occur only for a specific newsletter signup form. It would be nice if your form shortcode would allow for this in the future (on success go to “http://….”). Currently I just tweaked your redirect to include the HTTP_REFERER so I could pick it up on the template, then forward the request on.
thanks for the great plugin