If you understand the principles behind website templates you will immediately see the huge benefits to WordPress template systems. Basically it is designed to hookup automated template ideas to a system via which a client who knows nothing about anything can access your site (behind password protection obviously) and update and manage the website that you leave him.
The design of newsletters has become easier than ever before with the help of easy to use newsletter templates, that are available to download on a number of websites. The problem then becomes the content, and how to fit this into the template in the most interesting and eye_catching way. There are a number of different techniques that can help you work out how to get your message across in the most clear and appealing way possible. It may be helpful to work out this content in advance before choosing the template, so that you can adapt it into the design model of your choice.