Here are several good short articles from Harvard Business Publishing’s blog by David Silverman, where he addresses writing in business. Even the ones referring to email apply to other forms of business writing like letters and memos.

1. How to Revise an Email So That People Will Read It
2. Quiz: Are You a Grammar Geek?
3. 4 Tips for Writing Better Email
4. 10 Business Words to Ban
5. Why Is Business Writing So Bad?

Take a look. They are not that long but still can help improve anyone’s business writing.