Before we do anything I really recommend making a copy of your original image. This way we can get back to the original... just in case.
Just click and drag your Background onto the New Layer Icon at the bottom of your Layer Stack.

Now we need to lift the shadows to give a nice even 'tone mapped' feel to the image.
For those people lucky enough to have Photomatix then you can run an actual tone-map to lift the shadows and even everything out
Shadow/Highlight adjustment is found in Image>Adjustments>Shadow/Highlight....

Set this so you have a nicely balanced image. If your image is already nicely balanced then completely skip this step.. I've used the settings above.
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Copy your layer again (as above).
If you've downloaded the free plug-in from Step 1 we are now ready to do our fancy filter. Obviously each image will have different settings, but these are the ones I used for this image. Just play around until you're happy and Click OK.

You can probably see straight away that we are already pretty close to the Lucis Arts Plug-in.
If you are happy you can almost stop here.