One of the things I find useful at ExcelForum is that the user's profile specifies what version they are using. It's not always accurate, but it does help tailor your responses quite a lot.
I don't think I've ever really seen any good ways of getting first timers to post clearer questions: when the questions are really unclear, it's more often than not because the user is trying to phrase things according to the way they think Excel might work, when they don't really know. Perhaps something to suggest they explain in simple terms what they are trying to achieve, as well as how they are attempting it?