they are great books, and well put together too, but they are wicked expensive.
way out of my price range. but very inspirational.
to those without the cash for books like these, you will find all the info you ever need on games related art creation on the wonderful interweb. game-artist.net is a good one. 3dbuzz.com is another. there are a lot of them, and it might be an idea to get a sticky thread going with links to tutorials relevent to games development.