SU+J — journaled soft updates
http://jeffr-tech.livejournal.com/22716.html
http://jeffr-tech.livejournal.com/22933.html
http://jeffr-tech.livejournal.com/23615.html
http://www.mckusick.com/BSDCan/bsdcan2010.pdf
bsdtalk -
http://cisx1.uma.maine.edu/~wbackman/bsdtalk/bsdtalk186.mp3