Book excerpt: A brand new edition of the highly successful M-Libraries series, this draws together cutting-edge international contributions from the leading authorities in the field. Based on the proceedings of the Fourth International M-Libraries Conference held in Milton Keynes in 2012 it explores the variety of work that libraries are doing across the world to deliver resources to users via mobile and hand-held devices. The main strands of discussion include: - Imagination - looking at the future of m-libraries - Transformation - focusing on the transformation of services, learners or institutions through the introduction of mobile technologies - Inspiration - focusing on mobile innovation - Implementation - case studies of successful implementation of mobile services - Collaboration - a discussion of mobile strategy and ideas. Readership: Information professionals in all sectors and researchers, educators, technical developers, managers and library professionals. It will also be invaluable for students of library and information science and newcomers to the profession.