Something else that is interesting:
The iPad SDK documentation indicates that unlike the iPhone, the iPad has a "shared storage area/folder". On the iPhone, each app is walled off and unable to access the data from other applications. On the iPad however, this shared storage folder acts like a "My Documents" folder. So it would be possible to store a file in the folder & access it from multiple applications.
ie: you could import a video file from a SD card and open it up in one or more editing apps.
Also, according to the iPad SDK, the iPad will show up as an external storage device when plugged into a computer - you can drag & drop files to it.
Source: MacRumours