http://martinfowler.com/bliki/FeatureBranch.html
http://codicesoftware.blogspot.com/2010/03/branching-strategies.html
http://msdn.microsoft.com/en-us/library/bb668955.aspx
http://msdn.microsoft.com/en-us/library/aa730834(VS.80).aspx
http://www.cmcrossroads.com/bradapp/acme/branching/
http://www.vance.com/steve/perforce/Branching_Strategies.html
http://blog.gravityfree.ca/2009/02/using-feature-branches.html
http://blogs.open.collab.net/svn/2008/07/subversion-merg.html
http://thinkernel.bokee.com/4518935.html