Cover photograph (Copyright © 2007, American Society for Microbiology. All Rights Reserved.): Scanning electron micrograph of the cellulololytic gliding bacterium Cytophaga hutchinsonii, showing cells gliding on and digesting a cellulose fiber. Genome analysis of C. hutchinsonii reveals novel features of its cellulolytic system. (Electron micrograph courtesy of Maren Burmeister and Heather Owen.) (See related article on page 3536.)