Hey Pam - Thanks for the awesome post. My favorite sentence: "Becoming a social business is not the same thing as doing social media or being social." This is a concept many strategists, 'social media experts' and young companies struggle to grasp (or are mislead to believe).
As far as leaders in the insustry: Joe Pulizzi (Content Marketing Institute), Joe Chernov (Eloqua), Brian Solis (briansolis.com), Stephanie Tilton (Savvy B2B), Aldath Arbee (Marketing Interactions), and Doug Kessler (Velocity Partners UK) -- are all cutting-edge, insightful and not afriad to push the envelope.
As a knowledgeable content marketer yourself, I'd like to invite you to share your ideas on content marketing in our one 'Content Marketing Forum'. Present are interviews with and articles by leaders such as mentioned above. Shoot me an email if you are interested (firstname.lastname@example.org) and I'll send you the link to check out- look forward to reading more from you.