Watching Janne's videos - is there a player with slow motion?

I've been watching the videos that Janne posts, and they are great.
Thanks Janne!

I'd like to see them in slow motion, especially with a 'single frame
advance', or whatever it's called.

I'm using a player called DivX, which seems fine to simply view the
video, but doesn't seem to have this option.

Can someone recommend another player that does this?

Thanks!

Erik Brooks,
Seattle