SSO for Clouds
How close are we?

Now that SFDC supports SAML 2.0 (plus oAuth) standards for Single Sign On, that joins them up with Google AppEngine as 2 of the major cloud providers on a common path. This should bode well for SSO I would think. However, I think Amazon, particularly for S3, needs to get on board, since they are by far the biggest player in IaaS with the greatest number of independent developers, for the tipping point to come. EC2-based apps can obviously be SSO-enabled by the app developer deploying on it, but doesn't t it make sense to have this facilitated for app developers who are not SSO experts) ? And SSO, as I said, for S3 in particular opens up a lot of options for collaborative applications, options for collaboration that is also secure and managed.