I met Trey Ratcliff at the Virtual Worlds 2007 conference in NYC last month, and have been drooling over his stunning photographs from around the world.
Also check out the interview on his site Stuck in Customs where he talks about his technique:
"HDR brings the phi ratio [the 'golden ratio'] to colors and luminosity rather than to geometry and angles. Humans use their neocortex to patch together a visual scene. People do not take a 'photograph' in their head and store it at a single shutter speed, aperture, etc. On the scene, the human eye is constantly darting around and the iris lets in more light in some areas and less light in others. This “patchwork quilt” is made up of very different light levels and colors. These most beautiful scenes have colors that lay on top of the geometric patterns that traipse up and down the spectrum in a phi pattern. I’m slowing evolving my HDR process to nail those phi patterns within color and luminosity to bring a visceral reaction of beauty from the viewer."