If you’re a member of ACM, you have access to about 1200 books online through Safari and Books24x7. Safari’s catalog is here, Books24x7 is here. Just login using your ACM ID & password. I can’t say the book selection is that exciting, some are half a decade old or older (bad for books about APIs), though there are few that might be of interest. If nothing else, there are some guides to popular packages and languages that might help you out.
Worth a reminder: if you’re an ACM SIGGRAPH member, you also get access to essentially all computer graphics papers in the ACM’s Digital Library. I took a peek today to see if the I3D 2012 papers were up yet (the conference runs this weekend) – no joy there, though 2011’s are available. At least, I’m pretty sure 2012’s are not up. Personally, I find their searcher kind of poor if you want to search through proceedings, but is otherwise serviceable for individual articles. As usual, Ke Sen Huang’s page is the place to go to get most of the latest articles (with no membership needed).
Oh, just to reel off some other free books that might be of interest: Autodesk’s “Imagine Design Create” book, a free PDF. More for designers but full of pretty pictures and there’s stuff on game graphic design, along with films and much else. If you’d rather have the coffee-table version, get it on Amazon.
Me, I just finished the crowd-sourced sci-fi “Machine of Death” compilation, which has nothing to do with computer graphics but was an interesting bedtime read. Free as an ebook or audiobook, or again in physical form from Amazon.