I don't mean to get your hopes down, but the IDE port on the ACA520 won't be useful for swapping files, it can only be used as an internal boot drive, even with a CF card on an IDE adapter, it won't be hot-swappable. However, there are USB and SD reader projects for the parallel and serial ports, so if someone ends up building a batch of those you could use one to swap files back and forth.
Sorry I can't recommend a camera.
