David Sowden gave a great presentation (session: http://altc2009.alt.ac.uk/talks/show/6869 ; materials here: http://prezi.com/-90jqrzyxcuy/view/#37)
Caboodle, a UPortal-based aggregator of learner facilities for 17000 lifelong learners in 10 colleges and one university, provides SSO for all the VLEs (Moodle, Bb & Sakai), queries MIS in all the colleges and uses Sun ID management system to authenticate users. Firmly asserts learner is central?
rWorld2 