One fundamental point that tends to get overlooked is that unlike CDs or cassette tapes before them, books traditionally came with built-in DRM, insofar as copying them (via scan/OCR/proofread) was a really tedious process. Whereas it's relatively easy to crack the DRM on, for example, MobiPocket or Microsoft Reader books (and probably ePub by now). So the DRM'd formats are easier to pirate than the previous "analog"-analog format. What this portends for the future remains to be seen, but wearing my full-time novelist hat, I'm a bit worried. The music industry has efficiently trained people to grab files without throwing money at the artists, by bringing the role of publishers into disrepute. Now we're all set to repeat the experience, and unlike a rock band, most authors don't perform well on stage.