My thoughts on this are quite basic. My handouts contain an outline of my lecture, copies of any critical charts/figures, and a references or further readings list.
Not all see things my way. Look at any recent FGS/NGS conference syllabus and count the number who do not use outlines. Look at who they are. They are an impressive lot. Some people feel outlines invite people to steal the lecture. Frankly, if you can steal my lectures you are pretty impressive. I use very little script. Most of my illustrative anecdotes are spontaneous, and my humor makes the heavy content load palatable. None of it goes in the handout. OK, sometimes I include boxed quotations of my profound generalizations.
I often explain that the outline is there so the learner can see where she should arrive at the end.
Some lectures include sections in the handout for people to write down key definitions. or to fill in blanks. Done well, within an outline I like that. G. David Dilts AG did a presentation once that had a handout consisting of summary paragraphs for each section pf his lecture, with blanks for many key words for learners to fill in. I wondered how well that worked.
I insist everyone at my lecture have one for free, and do not allow them to be sold by my host to those not attending.. Nor will I permit them to publish it in their newsletter/journal/website.
I stipulate in my contract that I own copyright to the handout and the host may print sufficient copies for those attending. I usually collect the extras.
What do you think?