Vertical Response is an e-mail marketing service you can use to send newsletters and other mass e-mail marketing. As a holiday gift to the readers of the Vertical Response blog, they released a marketing guide titled 10 Great E-mail and Social Media Marketing Resources. This resource includes tips to ensure your subject line doesn't tip off SPAM filterd, ways to make sure your e-mails look standard in all e-mail clients, copywriting help and seven other useful links.
You can view the guide here: http://blog.verticalresponse.com/verticalresponse_blog/2010/12/happy-holidays-marketing-guide-our-gift-to-you.html.
Hopefully the resources in this guide will be helpful for your organizations' communication strategy.