ok, i was wrong then. the psp does at least say excuse me before it shuts off on you.
Though you have to admit that its hard to pay attention to one tiny green light, blinking or not, when its conveniently covered by your right thumb when you're holding the psp. (and no, i don't routinely push my home button to check my battery every now and then when i'm playing a game either.)
anyway, back to the subject at hand. i just got my bonus chrono trigger CD in the mail! yay. too bad only 2 songs though.