If you have a weak stomach when it comes to $50 peripherals coming under the knife, best to skip this one. A ChinaGBA forum-goer has posted a graphic, step-by-step autopsy of Sony's motion-sensitive -- but still rumble-free -- Sixaxis controller. What did they find inside? Why, Sony guts of course! Namely some boring circuit boards, the requisite buttons, but -- most importantly, if you don't feel like having Sony do it for you -- it looks like you'll be able to easily replace that non-user-replaceable battery we were so worried about.
See also: IGN says the PS3 controller is poopsky and then IGN likes the PS3 controller now (kinda)
[Thanks, ChronoZaga and Meh]