Consumer Cloud -- User-Centric Identity Management with SSO-Authentication

With the broadening of services offered in the cloud, the identity management and authentication of users to the services is under pressure to be decoupled from the cloud services themselves. The goal of a flexible, user-centric identity management infrastructure for a consumer Cloud must be to allow the user to quickly determine what information will be revealed to which parties and for what purposes, how trustworthy those parties are and how they will handle the information, and what the consequences of sharing their information will be?