A
retraction, and a ‘RTFM’ moment. Joystiq linked to my original, fuming,
steam-out-of-the-ears post about how import PSPs didn’t work with
YourPSP.com, and a discussion quickly sprang up – turns
out some people with Japanese PSPs have managed to register them on
YourPSP.com. So I’ve checked the YourPSP.com, and have got mine to
work;
you have to fudge the purchase date and the model number selection
box, and use the serial number from inside the PSP, not the one printed
on the sticker on the bottom (oddly it seems to have 2 serial
numbers?), but once this is done, YourPSP.com will accept import PSPs.
So I well and truly jumped the gun there! My apologies to all
concerned.

original