Like the SB-900, this flash can zoom from 17-200mm, and it also lets you select from three different light distribution patterns: standard, center-weighted and even. It also autmatically detects the size of the sensor in the camera it is attached to, and adjusts the spread of light accordingly.
The SB-910 works as a stand-alone flash unit or part of a wireless group. It supports Nikon's Creative Lighting System (CLS) and uses the i-TTL system for metering.
For more details, visit the manufacturer's site.