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"HP Jornada 680 (upgraded to CE 3.0 and 32 Mb if I remember well)"
Nope...it had CE2.11 as it core OS. What it had was Handheld PC Edition v3.0
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"does anyone knows where can I get one?"
You see the cables and docking stations on eBay periodically. Look for CR-A10 or CR-M10
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"USB IR adapter...any model to suggest..."
If you buy an USB infrared device, it will be "hit & miss" as to whether it will work with ActiveSync. Some do, some don't. I have an Actisys IR2000UL that works perfectly via USB with both ActiveSync on my XP machine and the WMDC on my Wn7 machine. Also I have an Extended Systems ESI-9680, which is a serial IRD adapter that works with the serial port on my computer. It came from a Casio PC-Unite wristwatch
(which I still own
) and is actually the ESI device with a different label.
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"...repository of software..."
Nearly every program ever written for HPCs is in the downloads section of this website. You will have to search to find out which are CE1 compatible.
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"...get somewhere the CE 2.0 ROM..."
Nearly impossible to find...you would be better off just buying a handheld with CE2 or newer on it.