Great article. I found this to be especially interesting:
A cat's posture communicates a lot about how that cat is feeling. If your cat is lying stretched out, belly up, it is very warm in the room. A huddled and stiff position with the tail wrapped tightly around the body indicates that the cat is cold. On the other hand, if the cat is in a similar position without the stiffness, or is curled up on her side with her tail wrapped loosely around her body, this indicates a healthy and content cat.
I'll have to watch my mosnters now to see how they curl up.