Scientific papers, newspaper archives, and image archives, and music.
The logic behind the first two is that I'd like to move the stuff we use as
references into the Wikimedia space.
The logic behind the second two is to extend Wikipedia etc. with material
that can't simply be re-expressed.
That is, I can "de-copyright" some written fact by rewriting the same
information. I can't "de-copyright" a photograph very easily.