When you start a new series consider whether it’s time to be more overt with some study instruction. This is especially helpful when shifting to a new genre. For instance, after spending some time in an epistle you shift to a series from Proverbs. Help people re-orient themselves by deliberately setting aside a message to communicate the basics of Proverbs – how they work and how to study them. By demonstrating this with a particular proverb the sermon still has definite value in itself. However, if you are able to equip people to study the Proverbs for themselves, then the sermon’s value is inestimable.
Instructing and equipping people to handle the text should be an ongoing project, but why not let that project boil to the surface when moving into a new genre (Psalms, Proverbs, Parables, Prophets, ePistles, etc.)
Biblical Preaching 
One of the core discoveries (admissions?) of WillowCreek recently in their much publicized self-evaluation was that they were not teaching people to feed themselves. (Their “Reveal” study) They found that the longer people had been Christians the more dissatisfied they became with the church (I am refraining from all commentary on this). People became dependent on the church for feeding and while Willow highly promotes their mid-week intensive teaching time–more than most churches–no church can provide all the food a believer needs. They learned that they had to teach people how to be self-feeders early on in the discipleship process.
Your reminder that using our sermons to help people become self-feeders is critically important.