<i>Randomly substitute numbers for letters that look similar. The letter ‘o' becomes the number ‘0′, or even better an ‘@' or ‘</i>'. (i.e. m0d3ltf0rd like modelTford)*<p>This is essentially useless. Decent password cracker tools already try such substitutions. For example, John The Ripper contains such substitutions as part of the default ruleset.<p>Other than that and other nitpicks, nice article. People need to know.