Ok while I got a little time I just put together a few screenshots and will upload the sourcecode. its just a simple example - with the power of dynamic data you could do some really cool things with your emailer.
just make sure in the table of your database that contains your user details (name, email etc) that you have a field (of int (1) type so that it stored either a 0 or a 1, I did it this way as a user only needs to be 0 (not subscribed) or 1 (subscribed)). Once thats done then you would create the recordset in dreamweaver and filter by the newsletter value of 1. then use the universal email server behaviour. hopefully my screen shots are more then enough to go by.....
Chris