I would like (love) to use the iPad as a Netbook replacement for backing up and reviewing photos from my DSLR canera but the current (admittedly V1.0) iPad seems to be hardware bound in a couple of ways.
1. No SD card slot and no USB slot.
2. No way to copy files from SD card to USB drive (i.e. no access to the file system).
I know that there is the photography adapter/kit but that only allows you to connect either an SD card or USB drive at any one time and I assume only for the purpose of an Photos App. upload. I have a 16 GB SD card in the camera so I would have to get the 32 GB or 64 GB iPad to be able to backup more than 1 card, and I would have to get everything off the iPad at from time to tome to make room for more images.
Personally, I don't think that staying with iTunes as a de-facto "file manager" is going to work for the iPad. If nothing else it has to be renamed (which is long overdue anyway) but there also needs to be more direct access to the IO system.
With the current model, the only solution might be an App with a special IO adaptor (to allow simultaneous SD and USB connectivity) that would copy the files from the SD card to a USB drive and allow the imaegs to be reviewed. I have seen a post (eslewhere) from developer stating that even they don't have direct acess to the files. They can only access the "photo gallery".
In case someone is listening and plans to write such and App, here's what works for me (in this case written in PERL). I can nominate a destination directory (on the USB drive). I usually use the date and photogaphic subject as the name of the directory. The script creates subdirectories for JPEG and RAW files and copies any files that don't already exist into them (i.e. only photos that I have taken since the last backup). There is of course and application to view images on the Netbook. Another nice thing is the ths SD slot and USB port (4 of them actually) are built-in. The only bad thing is the screen image quality is not good, which is where the iPad has something to offer.