Vidrio projects your webcam over your desktop. Start Vidrio, then share or record your screen using any other app. You see yourself in the mirror, and your audience sees the same.
What's new in Vidrio
A bug fix. When changing the screen resolution, Vidrio wasn't resizing to fit. This was especially bad because screen resolution changes often happen when presenting, such as when switching to AirPlay. My bad, guys. I've fixed it, and now your presentations can be amazing again.