I added this because it's n-gram [0] data is useful for spell checking (among other things) as highlighted in the post on writing a word processor in 20 lines of python. [1]
Reference
[0] wikipedia, 'n-gram: sub-sequence of n items from a given sequence'
Reference
[0] wikipedia, 'n-gram: sub-sequence of n items from a given sequence'
http://en.wikipedia.org/wiki/N-gram
[1] chandrab, news.yc, 'From Google (Norvig): How to write a spelling check in 20 lines (very cool) '
http://news.ycombinator.com/comments?id=10967