Here are @seanbonner's posts about it:

http://blog.seanbonner.com/2011/11/21/progression-through-unowning

http://blog.seanbonner.com/2011/11/26/just-walk-away

http://blog.seanbonner.com/2011/12/02/unowning-solidification

http://blog.seanbonner.com/2011/12/20/2012-purge-planning

Good stuff.