Just curious. MGS1 and 2 had excellent art books released but I've never heard anything about a MGS3 one. Surely there must be one? I can't find one on a search except that some places have listed game guides as an art book.

I can't claim to know how good it is, but the 535-page MGS3: The Complete Official Guide is apparently about as close as a decent art book you'll get.  I've been told it's got a good number of pieces featured throughout, from final designs to even some conceptual artwork.

One actually came with the L.E. guide package from Brady.  Quite sexy.

It's a nice book, but it's a shame that only fourteen of the ninety-five pages are actually devoted to MGS3.  It boasts a surprisingly expansive focus on MGS1, though.