The TRT elevation~profile map with water sources, camp site suggestions and more was invaluable to us. This map is available from the TRT association or from:
http://www.takeitoutdoors.com/contact.htm
Also invaluable to us was the book, "The Tahoe Rim Trail" by Tim Hauserman (June 2002 Wilderness Press, Berkeley, CA.) This book is available from the TRT Association or:
http://www.wildernesspress.com/
I'm only going to put one hiking product on this site. Boots are vitally important for long distance treks and these boots didn't let me down. These boots are made for walking!
Montrail boots/shoes http://www.montrail.com/