Both Cat's Cradle and Sirens of Titan I thought were great.
"Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. This requires not that the writer make all his sentences short, or that he avoid all detail and treat his subjects only in outline, but that every word tell."
Of course that just is an introduction. The books goes on with many guidelines and lots of examples that really made it sink in for me.
I'd like to see a return to the sub-200 page novel. Nice quick reads, one-shot stories, for when you tire of yet another 10 book epic.
I've heard it said now, that Publishers won't even consider your manuscript unless you've already got another two completed sequels in your back pocket. It's all about the money.