Cheap, digital-publishing technology — especially print-on-demand options, which let individual buyers essentially commission copies of books — has been a godsend to writers without agents or footholds at traditional publishing houses. It has also been a quiet godsend to literary history. Books that defy traditional classification now appear in print, and reprints of public-domain titles account for the biggest category of self-published books. (There are more reprints published than traditional books.)
via nytimes.com