Books specifically made for games or animation tend to be underwhelming. You're better off browsing the Polycount wiki as well as video tutorial sites like 3dmotive and eat3d. I personally wouldn't recommend Digital Tutors or Gnomon because a lot of their game related tutorials aren't really up to date with current…
There are lots of great resources available Gnomon Workshop - Loads of Video Tutorials Ballistic Publishing - Game Art and CG books with tutorials 3DTotal - Lots of books and video tutorials and not forgetting the Polycount Wiki