Sketchbooks are for the messy bits, the silly bits, the throwing-spaghetti-at-the-wall bits. At the moment, I sketch in a cheap A5 spiral notebook with a Pentel Brush Sign Pen. Drawing in ink keeps me honest; I've found pencils make it too tempting to erase my lines until they're "perfect".
In Manhattan did C. Bradshaw / A stately thunder-dome decree:
