My SolidWorks 2013 Pick of the Day is the cleaner feature manager structure in the Sheet Metal environment introduced by SolidWorks 2013.
While the new folder structure is an important benefit for users, it introduces a major danger for people who are not familiar with the new interface. Trying to apply the old SolidWorks 2012 workflows for changing Sheet Metal settings might result in wrong Flat Patterns.
That is why it is extremely important to watch this video all the way to the end.
Note: SolidWorks is aware of this issue and will provide a fix in SolidWorks 2013 SP3.0.
Update (2013.Jan.08): Robbie Liotta from SolidWorks provided more information on how the new functionality is supposed to work in SolidWorks 2013. Please read the second half of this article:
Update (2013.Apr.14): This problem has been solved in SolidWorks 2013 SP3.0