The mobile Web is still evolving, and this is an exciting time of early development, but some hurdles still need to be overcome. This Library Technology Reports examines the various components of the mobile web and explores how they can and have been utilized by librarians. In the Report, author and library-technology blogger Ellyssa Kroski outlines the components of the mobile Web the users, devices, the operating systems, the services, the content and illuminates the research tracking how users currently engage with information on the World Wide Web via their mobile devices. Kroski also details several library mobile initiatives and provides a "how to" chapter for libraries interested in developing a mobile experience for their users.