Speak of which, what are your goals for a newsletter? One of the common failings for newsletters is a lack of focus. You will notice the contents of Right Writing News is about different types of writing including some writing tips and resources. I have a defined focus to my newsletter.
Maybe you want to write for a group of medical doctors in a speciality or an extended list of family or members of a civic group. You want your newsletter content to include the information that this particular targeted audience needs and expects. Focus is one of the key aspects of any newsletter so pick a target and be consistent.