Concept Art

Anybody know of any sites or books that explain how cool concept art is done. Like in star wars they draw those great paintings - i want to know what materials they use. Also some drawings are inked and wanting to know what they use as well.

A google search for "concept art" turned up this:

http://www.henryflynt.org/aesthetics/conart.html

http://tinyurl.com/aklxz

http://print.google.com/print?q=conc...us&sa=N&tab=wp

And that's just on page 1.

A few more:

http://whatisthematrix.warnerbros.co..._art_marc.html

http://www.animationarena.com/concept-art.html

These are two pretty cool books:

http://www.amazon.com/gp/product/081...books&v=glance

http://www.amazon.com/gp/product/034...books&v=glance

They're not about concept art per se, but include discussions and examples of it.