Welcome to my workplace!
It changes on a daily basis. :P I have loads of a4 cheap copy paper with rough sketches everywhere (as you can see up on the boards). They spread around the room (and sometimes the house :P) which isn't really appreciated.
A French watercolour storybook, held open by my favourite potato vodka.
Charles Vess' book to the left of my computer. (with some commissioned chibi ninjas... o_O)
Opaque thick medium to the left. Oil and Acrylics. Inks, chinese watercolour and gouache on the right in the little spice-rack thingey. 'Wetbox' on the bottom by the covered up monitor. Basically my set of watercolour that is kept wet at all times, using a pipette.