Scott, I am not sure how the photographer in question does this although I can tell you how I would go about a similar look (almost cross processed?).
Method 1:
i) Dupe image layer, set to colour blend mode. Despeckle, median and gaussian blur in smallish amounts (say 2-4 pixels). This will help clean up the colour component of the image (hue/sat) which will often fall apart and show all the subtle errors in the image such as JPEG compression when saturation is really pushed.
ii) Set a curves or levels adjustment layer above these layers, in colour blend mode. Apply linear moves, as in moving the white/black endpoints in the same exact amount to steepen the curve or to add more saturation.
*** The image/adjust hue/saturation command is poor for boosting saturation, but great for decreasing it.
iii) As an alternative for stronger colour - perform step (i) and clean the hue/sat component via indirect colour filtering. Create a flat dupe of the image. Convert to LAB. Make similar edits to the AB curves as described in step (ii). Convert back to RGB and blend this file as a layer over the original in colour blend mode.
The midpoint should not be moved unless you want to change the existing neutrality of the image (for LAB edits).
This post has only addressed the popping of colour - you may also want to look into luminosity blend curves or levels to adjust tonality in a separate fashion to colour.
Method 2:
Apply adjustment layers without making any changes to the adjustment layer (you just want the layer sitting there). Then adjust blend modes such as soft light, hard light, vivid light etc. You may also want to isolate this effect to the midtones and not the highlights/shadows as blend modes often destroy these areas.
Two articles at my site discuss techniques mentioned here:
Cleaning the colour component -
http://members.ozemail.com.au/~binar...ctremoval.html
Creating an 'endpoint mask' -
http://members.ozemail.com.au/~binar...litymasks.html
Hope this helps,
Stephen Marsh.