I'm reading Hughes book The Structure and Interpretation of Quantum Mechanics. I was wondering if people knew of any good web resources that graphically (maybe with Java applets, etc.) illustrate how the spin observables Sx Sy and Sz are related to each other, either in real space or in their representation in C-2. Basically I'm just looking for any kind of illustrations involving quantum spin that will help me get a better feel for it. Thank you.