I love that look as well and this might be a little help or none at all but I will throw it in the pot.
Try to have two copies of the original open....use one as your "play with". Try a color overlay, play with that a bit. Soft light, overlay, opacity, tones, till you get something you like. Then bring over the other original and play with it. Do a soft light, or adjust the opacity, you can even try lightly erasing areas to expose what is under (usually best if hte original is under the 'played with' layer so you are erasing areas of the new image and revealing the original.) I am trying to achieve the same thing and am struggling to nail it. So I am attempting to come up with my own variation and style.
I love this guys work and imagination (he is one of my inspirations). THIS is the look I would love to learn to recreate but with my own twist. The closest I have come is by using variations of the above.
http://www.flickr.com/photos/xavier_kxfotografia/page2/