Vin sent me a link to this article by Phil about Enterprise 3.0 at DrKW and their 4 pillars of Enterprise 3.0 which, as he pointed out, are very similar to the 4 pillars of Edge:
Publishing = Rich Content
Discovery = Discovery
Fulfilment = Relationship Management
Conversation = Collaboration
Of course they are also referred to by Andrew P. McAfee in his article "Enterprise 2.0: The Dawn of Emergent Collaboration" which I talked about in my last blog.