(Updated November 2012)
SEOBook Keyword Typo Generator – Use this tool to generate a list of typos and common misspellings for AdWords ads and domain names. This software/script should help you in the generation of a low competition keywords to save money on PPC ads or help you find low competition keywords which are easier to rank for with traditional SEO.
SEO Chat Keyword Typo Generator – Enter a keyword or key term into the box to generate a list of suggestions for likely human misspellings and typos. Because the results are based on the proximity of the characters on a QWERTY keyboard, and a database of common spelling/typo mistakes (as well as a few other factors), they are fairly accurate and likely to occur in a real world situation.