I'm stoked on Wikinomics

... but I believe there is no need to reinvent the wheel. So I reference Adam Jusco who summarized some of the business models discussed in Tapscott and Williams' book Wikinomics (2006). There are actually 7.

• Peering (indirectly building business through participation in open-source
  projects)

  Ideagoras (marketplaces where businesses can post their R&D needs to the masses and reward the problem-solvers, or offer up their unused inventions that would otherwise lie dormant and in secret)

  Embracing the Prosumer (encouraging/supporting customers who “hack” your products, creating new features or uses that your company would have never thought of on its own)

  New Alexandrians (breaking down the proprietary walls in the
  sciences, namely in the fight against disease)

  Platforms for Participation (opening up your technology to allow others to create or even profit from its use, which may add to your bottom line and/or strengthen your brand)

BTW Tapscott and Williams identify 4 elements (mindset?) that underpin those models: Openness, Peering, Sharing and Acting Global. Read the book to get the full flavor.