some people will bring along a laptop, if they have one.....
some people will buy a digital wallet (a moveable HD which can directly copy the photo from your card to the HD).........
Alternatively, i heard some hotels in Japan will provide services to copy your card to a CD with charges. So if you go to Japan, you may check whether the hotel you stay provide such services.
Today, I went to Golden Centre... FYI, 80G notebook HDD about $1040.- Thus, 40G should be half price (I believe)... In this case, it should be possible to get an image wallet around that price.