An article I did about good deposition questions appears at Lawyerist today: "Anatomy of a Good Deposition Question"--
It is easy to overlook what defines a good deposition question.
This topic isn’t merely for beginners. Even if you walk into a deposition with a solid plan, your plan can quickly change question by question. It’s at this micro-level — the way you ask each individual question — where many deposition errors are made.
To understand how bad questions can ruin your depositions, consider the anatomy of a good deposition question.
For more, see the full post. I've also covered the topic on Trial Practice Tips, making some of the same points but in a different way: "The Anatomy of the Perfect Deposition Question," a post from 2008.
You'll find much more about depositions at Trial Practice Tips in the deposition category.