The papers collected in this volume were first presented at the 14th International Conference on English Historical Linguistics Bergamo, 2006. Alongside studies of syntax, morphology, lexis and semantics, published in two sister volumes, many innovative contributions focused on geo-historical variation in English. A carefully peer-reviewed selection, including two plenary lectures, appears here in print for the first time, bearing witness to the increasing scholarly interest in varieties of English other than so-called 'standard' English. In all the contributions, well-established methods of historical dialectology combine with new theoretical approaches, in an attempt to shed more light on phenomena that have hitherto remained unexplored, or have only just begun to be investigated. Perceptual dialectology is also taken into consideration, and state-of-the-art tools, such as electronic corpora and atlases, are employed consistently, ensuring the methodological homogeneity of the contributions.