Jeanne Jennings reports regularly in The Jennings Report an e-mail newsletter with market research, articles and other resources for e-mail marketing professionals.
Jeanne has written for, among other organizations, ClickZ. Recommendations don't get much higher than that. Her website also contains a lot of links to helpful articles and tools you can use to improve your email marketing campaigns.
Here's the URL;
http://www.jenningsreport.com
Gary K. Foote
http://www.theemarketingdigest.com
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