I have updated the Sales Report with Graphs add on to work with ZenCart version 1.5.1 and have fixed a few errors I found.
http://www.zen-cart.com/downloads.php?do=file&id=848
(pending review)

The old support thread is here: http://www.zen-cart.com/forum/showthread.php?t=68417
It is locked now so I will start this one to help out any one who wants help!

Many thanks to www.healthyjavashop.com for sponsoring the edits. They have been successfully using ZenCart since 2007.

Jacob Bushnell