The easiest modern way is through wifi... that definitely does represent a bootstrapping issue - not really but something like that because you need the drivers on the Newton initially.

I mean... in a real pinch, you could (buy and) send me or whoever is most convenient a PCMCIA storage card and I can put the WaveLAN drivers on it. Then you'd also need a WaveLAN PCMCIA card. I can look up the model I use later.