Great little resource for anyone taking upper division organic chemistry classes. Listen to them while running/biking or just as another method to learn the material. Covers bonding, hybridization, resonance, acidity, alkanes, isomers, conformational analysis, mass spec, NMR, and reactions. Clearly...
Easily the most useful site I ever used during my Chemistry undergrad. AIST (Japan) put together a database of spectral analysis for anyone who needs to look up what a particular compound will look like under scrutiny. You can search by name, formula, weight, number of atoms, and certain NMR shifts...