An Introduction to Relativistic Electronic Structure - A set of lecture notes on quantum chemistry offered at a graduate or advanced undergraduate level. Although written for chemists, there are some useful lessons on relativistic quantum mechanics for physicists as well.
Modern Physics Course - A second year course on special relativity and quantum mechanics. All of the lecture notes can be downloaded, or viewed online.
Wave Particle Duality - A series of pages on the natures of particles and waves and their similarities in the field of modern physics. These pages are intended to aid the reader in the first year Quantum Physics