Hi, I have actually used this tutorial from Dark Design Graphics http://darkdesigngraphics.co.uk/cross-hatching-tutorial, the tutorial is very simple and easy to understand but works really well. I believe it is done by an Artist called 'Alasdair' and his drawings are incredible. I have tried to fine out more about him but…
tip: Try getting all your hatch strokes to follow the implied contour of the shape - It'll do miracles for the three-dimensionality. I'll dig through some drawings and see if i can find an example... *edit* bingo. went through some of my old sketchbook scans. Methinks it would be a fun tutorial to make though...