My 3 favourite art books of 2010 are, in no particular order:

Cover Run: The DC Comics Art of Adam Hughes
I am absolutely obsessed with Adam Hughes' art, to the point of downloading everything I could get my hands on on his website and DeviantArt page. So I had to get this book, which is really beautiful and well printed. If only it had art from other companies...

The Making of The Empire Strikes Back
I've been waiting for this one for so long...
I got the first book of the series and loved it. When I learned that there would be a book of the sequel, that also happens to be my favourite movie, I had to get it. And to my surprise, it's chockful of information on the making of the movie and things that surrounded it.

Alex Ross: Rough Justice
From another of my favourite artists, Rough Justice's got the beautiful sketches and rough work that were not contained on Ross' previous book: Mythology. It's a great complement to it.

I wish I could've added Color and Light and Framed Ink to this list, but they still haven't arrived!