When I gave an informal whiteboard talk on this topic at IQIM I remarked that after almost 30 years (Hawking first proposed that black holes destroy quantum information in 1974), theorists are still baffled by the black hole information paradox.
Three recent blog posts on the information problem and firewalls:
Scott Aaronson (see lively discussion), John Preskill (I stole the picture from John), Lubos Motl (I think Lubos has the physics right in his post but I would probably more polite to our colleagues about it ;-)
Earlier post on this blog. My recent paper -- see eqns (3)-(5) for discussion of density matrix similar to Motl's. Like Lubos and Preskill (and everyone else?), I was never convinced by Hawking's concession paper on the unitarity question, but I do acknowledge some similarities between his arguments and mine.
Finally, in recent discussions with Samir Mathur I became aware of his paper What the information paradox is not, which I recommend. (See especially the section on AdS/CFT.)
