From the Ten Minute Mentor site, offered for free from the Texas Bar CLE and the Texas Young Lawyers Association: "Irving Younger's Ten Commandments of Cross-Examination," by Robert Witte.
It's an audio-video web presentation that's simple to watch on your computer. First, Witte talks about whether you should cross-examine at all, then he examines each of Irving's ten rules.
Although cross-examination certainly doesn't begin and end with Irving's ten commandments, they're rules that every trial lawyer should know. If you want a written list, you can find it here (pdf).