Peter Adam, Principal of Ridley College in Australia, has a good brief article titled, “Fourteen incontrovertible arguments in favour of Expository Preaching.” This is a good succinct argument for the value of systematic preaching through books. It would probably be useful for handing out to a congregation, or even passing on to a pastor friend.
This page on the Ridley College sites contains other useful articles.

(HT: Greg Thornbury)