This interesting website created by Ehrler is entitled Modelling Basic Organic Reactions by VRML 2.0 Techniques . Sample the vibrational modes of trans-1,2 dichloroethylene . Requires a Javascript-enabled browser. Take a look at the Smells Database . You'll need a chemical viewer like RasMol to manipulate the smelly molecules, but there's plenty to learn even without fancy viewing.
Pyridine smells sour, putrid, fishy.