I also hope it gets done right. Look at Avaaz.org if you want an example of how to do it wrong. I signed one of their petitions and was put on their mailing list, but they send out email for some of the dumbest things, which makes me go numb to the idea of getting involved. I unsubscribed when they sent out a notice saying they wanted donations because they were being DDoS'd... and then sent a second email the next day. Annoying and irrelevant to the organization.