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I am not sure about this, but it seems like "JBoss SSO" is dead. The most recent download if from 2007.
But maybe "JBoss PicketLink" is a replacement. At least there is a "PicketLink based SSO" FAQ ;-): http://community.jboss.org/wiki/PicketLinkSSOFAQ
You might ask further questions in the PicketLink forum: http://community.jboss.org/en/picketlink?view=discussions
This might help!