My forms are submitted by workspace users. It would be nice to be able to capture their names so I know who submitted the form. I know I can add a custom field that lets them select themselves from the list, but if they are already logged in, why make them go through more hassle. Computers are about helping humans do less work, not more. =)
Perhaps the person who submitted it could also be an assignee, so that they can get notified when the resulting task is worked on.