The Viking World. Edited by Stefan Brink in collaboration with Neil Price. (Taylor & Francis, 2011). ISBN: 9780415692625. Paperback.
This is a scholarly handbook that I would recommend to the interested layman, too. It really is a state-of-the-art summary of Viking Studies. All major topics and geography are covered sufficiently in-depth to give you a good first overview. The articles in this volume also frequently point me in the right direction where to look for more good research.