Google announced this weekend that spelling corrections are now available in Google Suggest. Google is now showing “Did you mean?” suggestions/corrections for certain misspelling situations.
Google said if “you’re typing a query for which there are no search completions to offer, and yet some of your search terms do seem to be misspelled, Google Suggest will now offer a “Did you mean” suggestion for your query.” So this will only come up with no search completions are there and if there is a misspelling in your query. It will not currently offer a spelling correction if there are search suggestions available.
Also, right now, this feature is only available on the English version of Google.com. Google does hope to roll it out to more languages in the future.
Here is a sample picture of how it works: