I did a presentation on CoffeeScript at this year's JavaZone conference in Oslo, which I thought I'd repost for you here. I've been told it turned out fairly well—I wouldn't know, I haven't worked up the nerve to look at it myself yet. But if you're curious about this CoffeeScript thing and don't mind spending an hour taking a crash course, then here you go.

CoffeeScript: JavaScript without the Fail from JavaZone on Vimeo.

If you're too impatient to sit through an hour's worth of lecturing, you could just check out the slides, if for no other reason than to play with the embedded CoffeeScript development environment. Or just to look at the cat gifs.