I was wondering what that behavior really means, too, tuxluvr. What's funny in my case is that my first kitty, Saima, will roll over to have her tummy rubbed--but only for a few rubs! It seems like she gets too nervous after a couple of seconds and then she flips back over. I pat her tummy as gently as possible, but she still gets a bit freaked out. I know some cats will let you rub their tummies for as long as you're willin' (like dogs do!).