Really Good Emails - A large collection of good product email design.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
Good Sales Emails - Best sales emails from great companies
Flexmail Solution - Professional email marketing with powerful and easy-to-use features
Great Email Copy - A dose of emails from around the web.
Dragon Responsive Email Designer - Dragon Email Designer provides an intuitive drag and drop newsletter design tool.