If you haven't been by Mark Kennedy's blog lately, you're missing out on some truly great stuff:
Temple of the Seven Golden Camels: Design and Drawing
Must-read material. Stuff like this makes me lunge for a good pencil--or at least feel like lunging for one.
Bob Winquist would be very proud(and that's saying something).
a Ronald Searle sketchbook page Mark uses for discussion in his notes on drawing and design