Although it isn't photography in its purest form, I love the way HDR can really accentuate a photo.
Wiki's explanation of HDR:
"In computer graphics and photography, high dynamic range imaging (HDR or HDRI) is a set of techniques that allows a greater dynamic range of exposures (the range of values between light and dark areas) than normal digital imaging techniques. The intention of HDRI is to accurately represent the wide range of intensity levels found in real scenes ranging from direct sunlight to shadows."
Here are some of my favorites:
Courtesy of Abduzeedo