I wrote yesterday about why I believe there is a brawl brewing over identity. In that post I suggested that convenience will be the main driver for the adoption of a “unified identity” model in which the large players (Yahoo, Google, Microsoft, Facebook, Amazon, etc) will become the identity providers for their users across the Net. But I don’t think it’s the only driver. The unified approach is a more direct translation of our physical world identity model to the online world. While I may ch...