Some suggested readings kids with ADHD might enjoy and find helpful:

50 Activities and Games for Kids With ADHD (2006)
Patricia O. Quinn & Judith M. Stern

A Walk in The Rain With a Brain (2004)
Edward Hallowell, M.D.

Bullies Are a Pain in the Brain (1997)
Trevor Romain

Cliques, Phonies & Other Baloney (1998)
Trevor Romain 

Distant Drums, Different Drummers (1995)
Barbara Ingersoll, Ph.D.

Doing And Being Your Best (2005)
Pamela Espeland  

Eagle Eyes - A Child's View of ADD (1996)
Jeanne Gehret, M.A.

Glasses for the Brain (2006)
William McFarren, Ed.D.

How to do Homework Without Throwing Up (1997)
Trevor Romain

Problem Solver Guide for Students with ADHD (2000)
Harvey C. Parker, Ph.D.

Sparky's Excellent Misadventures (The "autobiography" of a schoolboy with ADD) (2000)
Phillis Carpenter