Advanced Encounters: Alternative Objectives, by Sneak Attack Press, is a meaty 40-page help guide to designing a true multilayer encounter. Any DM can throw some monsters in a cave and call it an encounter. Too often this is the default for DMs. If you ever want to achieve Iron DM status, you will want to hardily study Alternative Objectives.
Objectives begins with some great theorycraft- explaining to the reader 6 kinds of encounters that exceed the basic goals of kill everything encounters. Chapter 2 feels like a slight extension of Chapter 1, explaining how to deal with obstacles like skill challenges, non-fighting NPCs and difficulty. After all the theory is out of the way, examples are presented. The examples are well designed mini-adventures.
The examples could have been more generic.
Strong Buy - Advanced Encounters: Alternative Objectives is a great resource for the novice Dungeon Master who wants to up his game. The design information and examples will go along way in producing memorable encounters that are not just about hacking and slashing.
[4 of 5 Stars!]