Sun has a suite of identity management products under the umbrella of 'Sun Network and Identity Services'. Recently, it acquired WAVESET TECHNOLOGIES, which has its own suite of Identity products with more advanced features. I suppose the new integrated suite is called as 'Sun Access Manager'
For more reference
see this Identity management is a specialised domain and an interesting one. You can start reading more about underlying Sun Directory Server, LDAP, RBAC, SSO, JAAS etc. These are the buzzwords of identity domain. There is a good article on serverside.com about
Identity Management [ April 04, 2007: Message edited by: Rashmi Tambe ]