I'm curious as for what your user's usage rights are with this product. (Ever since Wizards of the Coast released their intent of re-establishing control with their Open Game License v1.1, it's become a wise move to check what users can and cannot do.)
Although it's currently available online for download, to what extent are players allowed to share the content? ie. One copy per game group, or allowed to redistribute in other places but non-comercially and with attribution? And then, to what extent are alterations and additional fan-generated content allowed? What if someone uses only parts of your system?
In short, under what licence do you release this to the world?