We've used spellcheck from the StatisticsClient on a number of occassions, and always just accepted it as an improvement over not having it. We're now looking to incorporate confidence in our logic for a client, but cannot seem to find any documentation for GetSpellcheck method other than the minimal information on World. There is a Distance property on the Spellcheck class, but I can't find any information on it. Is this published anywhere?

Are there other tools people are using in conjuction with search or are most people using this spellcheck method?