Computer Science Educators et al., I am curious how you lecture*:
Hacking on the fly?
What seems to work best for you and your students?
And if you're willing to share, I'd be interested to learn the student makeup (e.g. freshman, grad students, professionals) and general topic of your course.
*By lecture, I am referring to the times in class when you employ direct instruction. I realize this is rarely The Best Way to Teach, but I think it can still serve a useful role. (...She says, right before she is replaced by a MOOC).