In 2011, cell phones and mobile devices are ubiquitous. The vast majority of Americans now own cell phones, and over half of them have mobile access to the Internet through a phone or other mobile device. For libraries to stay relevant, they must be able to offer content and services through the mobile web. In this issue of Library Technology Reports, Cody Hanson provides a foundation for moving your library into the mobile world. He provides a data-based, comprehensive explanation of why now is the time to get mobile, and gives you the information you need to get started, including what mobile devices are on the market, strategies for launching and implementing a mobile presence, and the problems librarians are most likely to encounter in their endeavor.