I need some resources aimed at a Power User, so an nutshell overview and quick intro into how to manage them in SharePoint Designer would be ACE!
Have a look at this Mark, this is good free resource.
http://www.youtube.com/watch?v=jUtMmZHkXTA&feature=player_embedded
But there are few other paid options like Critical Path and PluralSight both done by Andrew connell 🙂