If s/he has never expressed interest, save your money. A college-age kid isn't a five year old who will be happy with anything - by that age we know what we will use and have space for.
iPads and tablets in general are not useful in a productivity sense, particularly since s/he already has iTouch for the apps/checking mail real quick on the go sense and a laptop. if s/he didn't already have the Kindle I could see the book angle but I really don't see the point of an iPad now. It's just a toy - not useful for productivity at all especially in light of what's already owned.