I have mentioned the brilliant website Mailchimp before. In a nutshell, it provides everything you would need to manage email campaigns including functions to collect and store peoples email addresses, design and send impressive looking emails and monitor what happens to those emails after you’ve sent them (whether they’re opened or if email addresses are dead ones etc…) on a thorough statistical level. And on a starter level, it’s free to use!
This site is ever expanding. Their latest exciting news includes the release of a free app for iPhone and Android users which allows you to monitor your latest campaign statistics whilst on the move. Fabulous stuff.