Our experience with the Corporate Executive Board’s Marketing Leadership Council has been outstanding. The Council provides best practice case studies and proprietary quantitative research from the world’s leading marketing organizations, which they make available to member organizations. CMOs participate in annual executive retreats, and the benefits to your entire organization are available via their website, white papers, teleconferences and in-person meetings.
www.mlc.executiveboard.com 

The CMO Council is peer-to-peer network exclusively for senior-level marketing executives, and they have a wide array of research topics and tools available for CMOs.
www.cmocouncil.org