With the iPhone 4S Apple introduced Siri which putted voice recognition and the way you interact to a new level. However, now a really talented developer created th Windows Phone app ‘Ask Ziggy‘.
Ask Ziggy is your Personal Assistant that goes beyond Siri functionality. You can Call, Text, Email your contacts, Update Windows Live, Facebook, and Twitter, Get Weather, Stock Values, Flight Statuses, Get Ziggy to do Math, or ask any question you want (i.e. Who is the tallest person?) all by speaking to your phone.
And indeed the best thing is that this app is completely free. So visit the Marketplace either on your Nokia Lumia 800 or click the following link.