EditFlow [http://editflow.org/] is a great plugin if you only have one content type and need to pass the content across several people. Unfortunately for me it does not support the creation of different workflows for different content types. That is why I found it a bit limiting. Interestingly, the guys developing PikList [http://wordpress.org/plugins/piklist/] and PODs [http://wordpress.org/plugins/pods/] approached the problem by suppressing the existing publishing meta-box and supplying their own. It seems that each framework (Piklist, PODs, and even ACF - Advanced Custom Fields) might have its benefits. But they are all vying for the same market place - the developer's time and the plugin folder on your WordPress install. I am not sure which I like most right now, ACF has it on admin UI/UX but PODs is really powerful. If WordPRess core added some management features for the existing capability in its APIs then we might not have this marketplace...