- Corpus of Contemporary American English — huge corpus of written and spoken texts. Start here!
- Other corpora from Mark Davies at BYU (TIME, British National Corpus)
- The Michigan Corpus of Upper-Level Student Papers (MICUSP) — new corpus of good graduate and undergraduate student writing at the University of Michigan
- The Michigan Corpus of Academic Spoken English (MICASE) — lectures, discussions, office hours, etc.
- Lexical Tutor (works best in Internet Explorer) — great set of tools, including the Vocab Profiler, Key Word Extractor, and List Learning software
- AntConc — freeware software for building your own corpus. Easy to use. Includes tutorials and videos.
- Collins Concordance Sampler
- Using Corpora in the Language Classroom — companion site to the book by Randi Reppen from Cambridge University Press
- Touchstone: From Corpus to Coursebook by Michael McCarthy — a free booklet from Cambridge University Press describing the development of their corpus-based Touchstone series
- Explorations in Corpus Linguistics by Michael McCarthy, Cambridge University Press.
- Teaching Vocabulary: Lessons from the Corpus, Lessons for the Classroom by Jeanne McCarten, Cambridge University Press.
For an introduction to using corpus searches to learn language, please watch my two video presentations from UNC: Part 1: Real World English; Part 2: Advanced Corpus Searching. Note that the interface for the Corpus of Contemporary American English has changed a little since I made the videos, but the basic procedures are the same.