Multi-column layout with css is hard. About 5 years ago there was a flurry of activity to find robust ways of doing two- and three-column layout, resulting in a number of canonical techniques, and Meyer was one of the large contributors to that effort. This book covers those techniques in detail, and that section alone is worth the price of the book.
Meyer has for many years been consistently at the front of the pack in devising and writing about techniques of (what was long ago called) dynamic html and the creative use of css. This latest of his books is an excellent addition to his work and to any web developer’s library.