Purpose The purpose of this paper is to provide an overview of the current state of worldwide mobile usage; mobile technologies; libraries' use of mobile technologies including a review of library mobile catalog options, both vendor-supplied and in-house created; perspectives from current library leaders and innovators on the importance of incorporating the libraries' resources into the mobile environment; and future directions for mobile library services. Design/methodology/approach-A range of recently published literature (2008-2010), which aims to provide practical statistics and resources for libraries wishing to mobilize their web site, is summarized in order to provide the reader with tools for creating a mobile library proposal. The sources are sorted into sections: mobile phone popularity, smartphones/web-enabled phones, mobile phone use, library mobile web sites and catalogs, and what library leaders have to say. Findings The paper provides an evaluative summary of mobile statistics and resources, indicating the salient points and how to find more information for libraries wishing to draft a mobile library proposal. Practical implications The paper presents a useful source of information for both libraries wishing to create a proposal for a mobile library site, and for libraries that simply want an overview of the current state of mobile use and technologies. Originality/value The paper includes up-to-date data about worldwide mobile phone penetration rates and mobile phone use, and is the first to argue for proposing the development of both a mobile library web site and a mobile catalog.