Getting back to Content Marketing plans and tracking what works for you, here's a great diagram by Joe Pulizzi, Junta42. He posted this from his book Get Content, Get Customers, co-authorered with Newt Barrett, and posted it recently on Posterous.
Joe also wrote a great post on his Junta42 blog that ties in with my other posts this week about tracking your marketing efforts. It's called Building a Marketing Asset: Take the Red Pill. It's worth reading.