K.C.
We have two that worked really well for us:
Once Upon a Potty for boys (especially helpful b/c the character has the same name as my son)
His actual favorite is The Potty Train. The story is cute, as are the graphics, and he loves trains so he wants to read it over and over. http://www.discoverytoyslink.com/esuite/control/product?P...
Good luck!!
K.
http://oc.citymommy.com
http://www.discoverytoyslink.com/karenchao