There are many different styles of lecturing, and many different aspects that are blended together to give a whole "lecturing style". That said, I'm particularly interested in hearing people's experiences with so-called "handouts". At one extreme lie the lecturers who "dictate" a set of notes (usually not actual dictation, but by writing on a board) whilst at the other are lecturers who distribute complete lecture notes in advance.
As this is math overflow, I realise that it is extremely unlikely that it will be possible to answer the question "which is better", and I realise that this probably depends much more on other factors than just whether or not notes where given out or not, but to help me decide what to do then I'd like to hear people's experiences - both as lecturers and students. If anyone can point me to actual research on this in the (mathematics education) literature then that would be an unlooked-for bonus.
(Minor edit: in light of the way that comments get displayed in "short form", I'd like to make it clear that the "Andrew" referred to in many of the comments is not the same "Andrew" who edited this question! Unfortunately, if I put this remark in a comment - which is where it belongs - then it wouldn't be seen by those casually stumbling across this question and so those most prone to making that assumption!)