Not really, its not a secret organization, hell Ive been a subscriber for a long time and I guess my email will be included in this dump.
You misunderstand. Your email _address_ (and mine) have already been leaked, shortly before Christmas 2011. What WikiLeaks is now publishing is a list of actual internal emails, as in, the content of their internal, private communication. Unless you were a source for them, or a buyer of their more confidential information, you won't be directly affected by this leak.
How is it going to hurt a lot of people?
I think the impact could be bigger than you suggest. Communications between Stratfor staff, clients, and sources are buried in this data dump. There is an entire spreadsheet of non-US media contacts who had agreements of some kind with Stratfor. There is correspondence between Stratfor executives and their attorneys that was most certainly subject to attorney/client privilege before it was posted. This only scratches the surface.
Attorney/client privilege is meaningless outside a courtroom, legally, and practically.