The book Visualizing Data by William S. Cleveland (Hobart Press, email@example.com) discusses a number of visualization methods that are fundamental to trellis display and illustates them with many applications.
Trellis display was first introduced in the article "The Visual Design and Control of Trellis Display" by Richard A. Becker, William S. Cleveland, and Ming-Jen Shyu in the Journal of Computational and Statistical Graphics . The article serves as a good introduction to the basic ideas of trellis. Postscript copies are available online in [color] or [black&white].
Trellis was developed initially in the context of large data sets, but recent experience has demonstrated that it is also useful for modeling data from designed experiments, even small experiments with a moderate number of factors and a limited number of runs. This is discussed in the article "Trellis Display: Modeling Data from Designed Experiments" by William S. Cleveland and Montseratt Fuentes. Postscript copies are available online in [color] or [black&white].