Could someone please advise me on how hot this G4 Powerbook A1139 model runs. i.e. is it reasonably comfortable on the lap, or rather a case of 'hot chestnuts roasting etc'........ I'm asking as I've seen a very clean one priced 'just right', but as the seller is not local, I wouldn't be able to test it regarding heat transfer prior to purchase. I have a 667MHz G4 TiBook now performing beautifully since installing TenFourFox with the recommended tweaks, but it gets pretty damn warm on the lap. Must confess I've yet to re-apply thermal paste to the heatsink which may help some. But I would have thought there must be some significant difference in heat transfer between the 667MHz G4 and 1.67GHz. Or do the (improved?) changes to the fan configuration make the A1139 a reasonably comfortable 'usable' laptop? I would also be interested to know how does this 17" 1.67GHz model compare to the 17" 1.5GHz?