Brussels, October 1927. Picture taken at the 5th Solvay conference. home 
Foundation of Quantum MechanicsYou may jump directly to one of the following topics:

Resources on the history of quantum mechanicsI have collected some material on the history (and interpretation) of quantum mechanics. Many original paper can be found here. Links to secondary literature on the history of quantum mechanics are collected here.The measurement problemIt is widely held that the measurement problem is the central problem of quantum mechanics. As far as I can see, the different interpretations of quantum mechanics can even be classified according to their way how they tackle this problem. Here you can read more. Somewhat related is the question of the classical limit of quantum mechanics. Some resources on this question are collected here.Properties in quantum mechanicsHere I have collected some remarks and references on one of the most fundamental departures from classical physics which QM introduces: the concept of a "property".The de BroglieBohm theoryI have written a (German) textbook on a rather less known interpretation of quantum mechanics. It is called the de BroglieBohm theory or Bohmian mechanics for short. It allows what is usually regarded as impossible, namely a deterministic description of quantum phenomena in terms of particle trajectories.Some more of my work on the de BroglieBohm theory can be found here (and on the arXiv):
The slides of a talk which I have given at the spring meeting of the German Physics Society in Dortmund can be downloaded here (PDF, German). Understanding Niels BohrUnderstanding Niels Bohr's interpretation of quantum mechanics seems to be a tricky business. Here I have tried to provide some guide to the recent literature.Interpretations of QM and their interrelationGiven the perplexing number of different interpretations of QM it seems promising to investigate their relation. Perhaps some turn out to be not so radically different after all? Look here for some material on the topic. 