I am interested in reading about the philosophical ideas about authorship, and what it means to be an author. Could you recommend any good anthologies or other texts that might help me get started?

I've thought about your question for a bit and I can only come up with a couple of titles, but they are really interesting works. One is Sartre's autobiography, The Words , which deals with the way in which writing (especially about someone's life) imposes a by-hindsight order and structure on events which falsifies the lived experience of those events (Sartre's novel Nausea deals with issue too, but less exclusively.) Another (which you may already be familiar with) is Foucault's essay, 'What is an author?', which discusses the social-intellectual roles of the idea of authorship, especially in the organization of knowledge.