Martin Paul Eve has published Open Access and the Humanities: Contexts, Controversies and the Future with Cambridge University Pres.
Here's an excerpt from the announcement:
I am extremely pleased to announce that my book, Open Access and the Humanities: Contexts, Controversies and the Future has today been published by Cambridge University Press. The book offers a background to open access and its specifics for the humanities disciplines, as well as setting out the economics and politics of the phenomenon. It also has a very fine preface by Peter Suber! You can download the book for absolutely free (under a CC BY-SA license) at the official website (click the green "open access" button). You can also buy an extremely good value paperback copy, with all my royalties going to Arthritis Research UK, from the usual suspects.
Digital Scholarship | "A Quarter-Century as an Open Access Publisher"