Smartbrief is a media company which compiles and publishes email newsletters and posts links on its site covering many topics in 20 industries. They work with trade associations to make it freely available. You can search right on their site.
Lance Loveday and Sandra Niehaus
David H. Maister
Michael J. Gelb
Roger Fisher, Bruce M. Patton, and William L. Ury
Jennifer Visocky O'Grady and Kenneth Visocky O'Grady