CAS and OpenID solve, roughly, two different problems:
* Single Sign On
* User account management
CAS for user-centric. Examples of user-centric scenarios would be Google Apps for Domains: One account for all these services.
OpenID for application-centric. Users will only use one or few applications you offer, and you can thusly simplify the process for them, by cutting the amount of username/password credentials your users have to maintain drastically.
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