Mark Earls has another good post on the pitfalls of seeking the "key influencers" as a way of instigating change.

I share Mark's scepticism about over-rational models for explaining how change happens, and also about the hero-centric notions of leadership that seem to go with them. (I've been browsing through Ramesh Khurana's Searching for a Corporate Saviour, which challenges that worldview too.)