The following video tutorials and books on industrial design sketching would be very helpful for the assignment on sketching objects viewed during the Sydney Design 09 festival.
Koos Eissen + Roselien Steur. 2009. Sketching: Drawing Techniques for Product Designers. UNSW Library 741.2/77.
Dick Powell. 1990. Presentation Techniques. UNSW Library 745.2/55
Alan Pipes. 2007. Drawing for Designers. UNSW Library 745.2/227.
Nenad Pavel. 2005. The Industrial Designer's Guide to Sketching. UNSW Library 745.2/236.
Spencer Nugent. 2009. Video Tutorial: Sketching a cellphone.