Matt Gemmell posted some interesting reflections on the difficulties of translating paper-based media to digital devices. It includes another reason (not that we need any more reasons, mind you) why skeuomorphic design practices are so problematic. From Augmented Paper:

It’s so easy to saturate electronic representations of paper with what I call “digital artifice”; the gratuitous and ultimately heavy and objectionable skeuomorphisms and decorations that betray a simplistic thinking process: let’s just make this look the same. That’s a damaging frame of mind, because it enforces a false dichotomy between the real and the virtual. Software should be an enhancement, not a replication.