Concept art: Whatever paper source is available at that instant. Includes notebooks, sketchpad, scraps of paper, food wrappers.
Also: EOS IX 28mm camera, memory
Storyboarding/scripting/writing fiction: modified Handspring Visor with (slightly broken) Targus fold-up keyboard; my computer
Primary Modeler and Animator: Ray Dream 5.5 (with various plugins)
Primary Renderer (sec. animator): Carrara 2.0
Secondary Modeler: 3D Studio Max r4 (Titan crack, nonfunctional on better computer)
Postwork: Photoshop 6
Also: A bajillion little programs that last an average of 15 minutes on my hard drive, used to perform various indispensable functions too numerous and minor to name.