Stacking UV + Polaroid Filters might help if you shoot color, an orange or red filter should help if you shoot B&W. Using a very Saturated Film (Velvia) + Pol and UV Filter is another option to get more vivid photos. Smoke and Smog can also enhance a picture, shroud the mountains in a mysterious fog, etc...
Those HD-Glasses seem to work like an Orange Filter, they cut of the Blue part of the Light Spectrum and thus cuts trough fog or haze. BTW Hoya has an orange polarizing Filter in it's program the Filter effect looks a lot like the effect you get with HD-Glasses
Link to the Hoya Filter:
Link to a HD Glasses review with pictures for comparison:
Good luck