I wondered at first why I had been asked to perform the task of commenting on the scientific discussion of this meeting, until a member of the Scientific Organising Committee pointed out to me that I have not published a serious paper on the subject of the colloquium in his memory (I am not sure whether this is more a statement of the seriousness of my publications, of my publication frequency or of the duration of Jørgen’s memory); however, I am presumably considered to be unbiased by recent advances. Nevertheless, the time allotted (for the oral address) and the corresponding space (in these published proceedings) are inadequate for a complete and balanced review – in any case, that is hardly either desirable or necessary, since the discussions are all still fresh in our minds – and therefore I have been freed to comment personally on some selected issues that have captured my interest.