I didn't always do this, I started doing it around the time I started making YouTube videos. I record myself reading through my whole talk when it's in very early draft mode. It doesn't typically come out like I'm actually giving the talk, there are tons of holes and incomplete pieces, and even more pieces that end up needing to be reworked, revised or completely discarded.
What I've learned most by recording myself reading through my talk is where I'm really boring. If I check-out mentally while listening to myself on the playback, there are obvious weak points that need some thought.
Give it a shot, let me know how it goes for you.
Do you have #talktips to share? Leave a comment!