Perhaps stating the obvious, but this won't work in Elements, will it?
You can do curves in Elements, can't you? I don't have a copy of it so I can't check, but you should be able to separate out the red/blue/green curves and create the same shapes.
I am using Elements 2.0 with the curves plug in. It doesnt allow me the option to tweak the individual channels. Just one overall curve channel. I wonder if tweaking the individual levels channels would give me a similar effect.
That was from using the low res image from the tutorial. A couple of levels tweaks, selective color and the hue/sat adjustment layers to b&w with reduction in opacity. Not as nice as Deb's by a long shot, but the tutorial definitely opens my eyes up to a different thought process on editing. Excellent tutorial Deb!