From The Goodman Center, which specializes in public interest communications with the motto "Good Ideas for Good Causes." Explore the whole Web site for excellent ideas and resources connected with promotional materials. You can download the newsletter in PDF for free; alternatively, employees of non profits can fill out a form to receive complimentary paper copies. Archives are available at the Web site.
Sample Marketing plans from Bplans.com
Some are free for downloading, from both profit and nonprofit entities.
"Why Bad Ads Happen to Good Causes"
This big illustrated PDF file is highly entertaining and informative, an excellent resource from agoodmanonline available for download only.