@Nigel: If you’re a registered developer with App Store publishing rights, you can download this. (You have to have paid your $99 and been accepted into the program by Apple).

Your blog link supports the contention that the chip needs more power how? Somebody says they ‘heard’ it struggles within a car? That’s heresay, not evidence. It copes fine in my vehicle.

Even if it DID struggle within a car, that’s nowhere near evidence of a chip limitation – it suggests either poor signal reception or weak signals; some reports (for example in Manhattan) indicate that just like all other GPS-dependent devices, iPhone 3G struggles where buildings encroach access to the sky (and thus the signal); if the issue is strong signals not being received well, then be aware the chip receives its signal via an antenna. Antenna implementation often leaves a lot to be desired (being a compromise between functionality and mobile device size/design optimisation) and constrains the capability of mobile devices.

There may well be chip deficiencies, but what you’ve stated is incorrect and not indicative of one.