Newsletter: Email Snippets
The WordPress Newsletter plugin Newsletter Snippets gives you the ability to save snippets of content that you use often for your newsletters. This spares you the tedious task of re-writing the same information over again every time you compose a new newsletter.
NOTE: Don’t confuse Snippets with Themes (they are two different things). The purpose of Snippets is specifically for content (what goes into the editor) and not for layouts. Use the Themes for layouts/designs.