Found a Lycoming Service Letter that describes the issues for Active and InActive aircraft:
Lycoming Service Letter 180
I also seem to recall an article by Sky-Ranch (although I could not locate it), that described hand turning an engine is helpful to lessen the likely hood of issues with sticking valves, lifters, pushrods, etc.
As a matter of technique, before I fly (usually once a week), I will pull the prop through a few times (backwards, aghast, oh the horror...no vacuum pump on my system) :-)