yeah, the powerbooks got heat, enough to even slightly burn you in some cases, but thats really the only problem. the machine runs great other than that. lol, I actually got my finger slightly burned by my powerbook a few days ago, it was funny, I kept showing the burn mark off 😛 "hey look, my powerbook burned me!" 😎
lol, anyway, the majority of the heat comes out the bottom and back, mainly around the area where the processor is located (back center), and as long as you are not sitting naked with the powerbook on your lap, its bareable, and sometimes nice during those cold nights. 😉