This months Drupal Users Meetup.
Presented by Lee Walker of Code Journeymen.
Topic this month will be using Mailchimp + Mailchimp Campaigns.
Your clients usually need email lists for different reasons, normally more than 1 list.
They want to make an email of some content they have created on the site.
Mailchimp makes this easy.
See how great Mailchimp is for organizing these email campaigns right inside your Drupal site.
Analytics and everything
Drupal 7, with the mailchimp module, and mailchimp_campaigns.