Custom Word List Generator.
CeWL is a ruby app which spiders a given URL to a specified depth, optionally following external links, and returns a list of words which can then be used for password crackers such as John the Ripper.
By default, CeWL sticks to just the site you have specified and will go to a depth of 2 links, this behaviour can be changed by passing arguments. All words of three characters and over are output to stdout. This length can be increased and the words can be written to a file rather than screen so the app can be automated.
CeWL also has an associated command line app, FAB (Files Already Bagged) which uses the same meta data extraction techniques to create author/creator lists from already downloaded.