"Twuition is like your personal assistant on Twitter. Want to know the temperature in Miami? Ask Twuition. Or the nearest location of a business? Twuition to the rescue. Here's how it works: Type in the appropriate hashtag (ie: twuitionweather, cityname), and @twuition will respond to you with the answer. There are currently four or five hashtags being serviced that include weather, locations, product pricing and a couple of others"

I could see this kind of service evolving into the backend of an easily-accessible app in the future. The @replies-through-twitter method that a few services are starting to implement lately is kind of clunky right now but I'm sure someone will put a nice interface around it soon.