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I don't doubt it, but it's more convenient to just plug the cable into the PSP than to remove and re-inser the card every time you want to copy something :\

No real resources, it's just a rumor, and probably a dumb rumour at that... I read it in one of the GameFAQs PSP hardware guides, and it was listed as being rumor - apparently the author of the guide has got several emails from people complaining about copying files from PC to PSP or something like ...

I've heard a rumor that PSP does not work perfectly with Sony's new Pro Duo cards (1GB and probably 2GB too). It's said that copying files from PC to PSP with this card inserted, does not work properly, or something like that. Is there any truth to this? Does anyone here have that card to try it out...