Is there a video player that can go at various speeds?
The VLC video player allows you to speed up and slow down playback of movies with the >> and << buttons.
There's no indication I can see of the amount of speed-up, and you may have to click the buttons several times to see a difference, but it does work.
I found a way to do it in native windows media player. I'm not sure why it was so deeply hidden, it is almost as if they didn't want people to do it.
CTRL+SHIFT+G -> fast forward
CTRL+SHIFT+N -> normal
CTRL+SHIFT+S -> slow
If you right click on the play button, you can see these options.
You'll be wanting Media Player Classic- Home Cinema. Does the job nicely.