Lawyer Ervin A. Gonzalez has some ideas about trial notebooks in his short piece titled "Trial Organization"--
One of the most important goals a trial attorney should have been the presentation of his or her case in a clear and orderly manner so that it may be easily understood by the jury. A trial attorney should strive to appear organized, in control, well prepared, and familiar with all aspects of the case. This is only possible if the organizational framework is created early in the litigation and well before the actual trial date. Every stage of the trial should be planned and organized several months earlier and the best way to do this is with a trial organizational system. There are two types -- a trial notebook or trial folder -- and they enable the trial lawyer to properly separate, outline and arrange all aspects of the case.