google presents a "did you mean ..." link on top of the page if the search terms look like a typo (according to a dictionary).
[see "http://support.google.com/websearch/bin/answer.py?hl=en&answer=1723"]
sometimes very useful to me - being a non-native English speaker who uses a lot of English search terms.
if you make the dictionary dependent on language/region preference, please think about including an English dictionary additionally.

Herbert
(using ddg since about a week)