El Kartero

From TomaCero:

El kartero is a fast massive e-mailer that allows you to create a template with your message and automatically send highly-visual, personally customized emails from a database.

Create an HTML template with your graphics, walk through a wizard to set up some database properties (such as what field contains your client name) and let El Kartero do the rest!. The result: Highly visual HTML emails, personalized to your contacts with a minimum effort from your part.