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As with all beta deployments, dont put anything you want to keep on this site.
Update by Ian Boston
One correction. RWiki for Sakai 2.x is at
!SVN!https://saffron.caret.cam.ac.uk/svn/projects/rwiki/!
!Confluence!http://bugs.sakaiproject.org/confluence/display/ENC/Sakai+Wiki+Tool!
!Project Page!http://saffron.caret.cam.ac.uk/projects/sakai-rwiki/!
!Demo!http://sakai-beta.caret.cam.ac.uk/portal!
You can self register and join "test site". The code in contrib is a v1.5 prototoype.