Here is the first installment of ‘Resources’ (not yet posted as a separate page).
Below are images of all the books specific to Bento that I have.

CLICK ‘READ THE REST’ AT THE BOTTOM OF THE PAGE
to see larger pictures and descriptions of each book.
To translate Japanese words, use this site: http://www.rikai.com/perl/Home.pl

サンリオキャラクターのおいしくてかわいいおべんとう
Sanrio Character Yummy and Cute Bento by 服部みどり
81 Pages, Published by Sanrio, March 2007, ISBN-10: 4387070196, ISBN-13: 978-4387070191, Measures 25.8 x 20.8 x 1.2 cm. Amazon selling page

基本のおべんとう
Basic Bento by オレンジページブックス (Orange Page Books)
Published by Orange Page Books, February 2004, #ISBN-10: 4873032717, #ISBN-13: 978-4873032719, measures 29.4 x 22.8 x 0.6 cm, Amazon selling page

おいしい・楽しいおべんとう100箱 (大型本)
100 Tasty & Fun Bento by Inoe Yukari
223 pages, Published by 成美堂出版, June 2005, #ISBN-10: 4415039499, #ISBN-13: 978-4415039497, measures 25.8 x 21.2 x 1.8 cm, Amazon selling page

うちごはん
House Bento
More information coming, not available on Amazon.

おいしいお絵かきお弁当
Delicious Picture Bento by 宮澤 真理
112 pages, published by 白夜書房, October 2005, #ISBN-10: 4861910714, #ISBN-13: 978-4861910715, measures 23.4 x 18.2 x 1.2 cm, Amazon selling page.

前川メグの愛され・レシピ
Meg Maekawa’s Love Recipes by Mayakawa Meg
95 pages, published by 学習研究社, July 2007, #ISBN-10: 4056048282, #ISBN-13: 978-4056048285, measures 20 x 19.2 x 1 cm, Amazon selling page.

パパッと15分!おいしいお弁当
Tasty Bento in 15 minutes by 林 幸子
Published by 西東社, December 2003, #ISBN-10: 4791612051, #ISBN-13: 978-4791612055, measures 23.2 x 18.2 x 1.6 cm, Amazon selling page.

Beginner’s Cooking School
Beginner’s Cooking School by Ajinomoto
This was a book given to those who took a cooking class (like I did) through Ajinomoto. I don’t think this is available otherwise.