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Originally Posted by bigbop
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Have a look at the STF201 docs: http://www.semtech.com/pc/downloadDocument.do?id=139 particularily figure 4. Pin 1 is used to clamp transients on the 5V line. I believe the actual USB data lines are 3.3V differential signals.
Newark Electronics sells the Semtech STF201-22 for around $2 ea ($25 min order). This is a very small surface mount chip and you need specialized soldering equipment and a good magnifying glass to solder to it.
I just had a GREAT idea :approve: - Instead of building the interface into the Axim, purchase a powered USB hub, wire it into an X50/X51 sync connector and let it be a dedicated interface - with several USB ports! Oh - I am so proud of myself 
Of course, we'll still need to place a couple of transient diodes inside the case - just not a whole interface circuit.
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Good! :approve:
Once having the hack working sure it could have several implementation ways.
But not all people will be able to do so delicate work :rolling: