An overhead pressing movement is important as part of an overall strength routine. However I'm against having a "shoulder" routine.
The pressing movement should be containted within the framework of either a push day, or as part of a total body day.
I'd add military press, push press, or even some form of olympic movement to your pushing day.
I also dont think an overhead press is a movement I'd do every week, unless I'm invovled in an activity that calls for it.