I started a thread last week at our forums named Answer --> Question Search Engine :: Jeopardy. In that thread, I asked, wouldn't it be cool to have a search engine that worked backwards? For example, you submit an answer, instead of a question, and the returned results would be questions. Kind of like how the game Jeopardy works.
I would love your thoughts, I don't see how useful it is, on a day to day basis. But I am sure SEOs can figure it out.
Forum discussion at Search Engine Roundtable Forums.
