The following are some art/graphic design-related publications I've collected over the years. Ellen Lupton's works are obviously a favorite of mine. :)
One: Color by Paul Zelanski & Mary Pat Fisher - A great resource concerning color theory and more. It explains four color process printing, the psychology of color, the use of color in different artistic practices, etc.
Two: CMYK Magazine - I recently picked up an issue of CMYK Magazine (as it was one of the lesser-priced art magazines!) which showcases new creatives.
Three: How to be a Graphic Designer Without Losing Your Soul by Adrian Shaughnessy - I just purchased this a couple weeks ago. Haven't gotten a real chance to sit down and read through it, but I like what I've read so far. :)
Four: Graphic Design Theory, Editor Helen Armstrong - A lovely collection of writings from then and now concerning the theory of graphic design with a wide range of topics. In my art history classes I always found the theory behind artwork to be the most fascinating part.
Five: Graphic Design That Works (Rockport Publishers) - A collection of examples of successful design, ranging from logo design to magazine layouts to promotional and identity design. A good book to glean inspiration from.
Six: Design It Yourself (D.I.Y.) by Ellen Lupton - Nothing beats real, hand-made d.i.y. work. This books gives approachable tips on how to go about designing and physically creating various things from books, zines, notecards, coasters, t-shirts, CD packaging, and more.
Seven: Thinking With Type by Ellen Lupton - This was actually the required textbook for my Intro to Typography class. Gives you the history, technical terminology and practical usage of type, as well as showing examples of unique type treatments.