This semester for the first time I'm having my course videotaped.
First consequence: I hear myself on tape. What a shock! What a strong accent I have! I never knew it! Can I fix it?
Second consequence: two students already told me that they had watched the first lecture on video; this is shopping period and it's a convenient way for them to test several courses being taught at the same time.
Third consequence: some of my TAs are going to watch parts of lectures, for the more challenging parts of the course or when they need a refresher (for example: log*n analysis of union find at the end of lecture this past Tuesday).
So far so good.
Another developing trend: some students had difficulty with a homework exercise using recurrences (which I did not cover in class). Instead of pointing them to a textbook, or to lectures notes on the web, the TAs pointed them to a video of a lecture on the subject at MIT, from a number of years ago: so, these videos are becoming resources for learning, competing with textbooks.
All good developments!