Gilles Fauconnier has written a brief, manifesto-like introduction to Cognitive linguistics, which compares it to mainstream, Chomsky-inspired linguistics. See Introduction to Methods and Generalizations. In T. Janssen and G. Redeker (Eds). Scope and Foundations of Cognitive Linguistics. The Hague: Mouton De Gruyter. Cognitive Linguistics Research Series. (on-line version)