
Fergie |

It is my understanding that if it has a wisdom score, it is a creature. If it has no wisdom score, it is an object. I forget if intelligent magic items follow this rule, but I think all monsters have wis scores.
EDIT:
PRD- "Every creature has a Wisdom score."
"Every creature has a Charisma score. "
So you need Int AND Cha to be considered a creature, not an object.
"Intelligent items can actually be considered creatures because they have Intelligence, Wisdom, and Charisma scores."