iContact.com iContact Free Edition: Email Marketing Platform for up to 100 Subscribers Free Email Marketing System for < 100 Subscribersget this deal
That should be enough to start for small businesses and if your list grows larger than that you can move to their paid plans which start at $10 US monthly for 500 subscribers to 100,000 subscribers for $699 US monthly.
As for the features, iContact.com has lots of easy tools to help you build your e-mails and messages without knowing any HTML including handy templates that make getting up and running much easier. After your e-mails have been sent, you'll also have complete access to statistics to see how often they're opened and clicked on. Sign up forms that can be integrated into your website or Facebook page is also provided to make it easy to get new subscribers.