I noticed Google was tuning up their Autocomplete Suggestions:
Better infrastructure for autocomplete. This is an infrastructure change to improve how our autocomplete algorithm handles spelling corrections for query prefixes (the beginning part of a search)
I've been focusing some research on autocomplete lately, because that's one place that affects traffic volume even if a page's ranking doesn't change. If the autocomplete handling DOES change, the traffic can go up or down by a good bit.
In this case their talking about how they handle typos early in the search query. That hasn't been part of what I study before - but it will be now.