You can download Steven Poole's book "Trigger Happy" for free from his website, as a CC-licensed no-DRM PDF. Yay!

[...] I thought I'd try an experiment, and give away for free an "ebook" version of my first book, Trigger Happy, with no "digital rights management" whatsoever. It'll work on anything that can read a PDF.

Trigger Happy is a book about the aesthetics of videogames — what they share with cinema, the history of painting, or literature; and what makes them different, in terms of form, psychology and semiotics. It was first published in 2000; this is the revised edition with the Afterword written in 2001. [...] The book is offered under a CC license, for a limited time only. I'm not sure how limited that time will be, so grab it while it's hot.