Admin: send email to all current advertisers

[oldengine]

Tool to gather up all current advertisers' email addresses to send out an administrative notification email?

Edit: Note that we can already send email to any one user group through vBulletin's admin panel. What I am referring to here is a comma or semicolon separated listing of email addresses for all those people who have active ads in the classifieds. There's probably an SQL Query for this, but I'm not up on it.