Ask Ziggy is a free application that uses speech recognition to search the web or send commands to the phone. The application integrates two engines for the recognition and surf the web to choose the most relevant answer. If a direct answer is not available a link is created to search results.
The version you see in the video is heading to the Marketplace as we speak but you can grab the slightly older version right now. Give it a go--it's free, useful and really quite an extraordinary app. Leib also has a lot of plans to further refine and enhance the experience including expanded speech grammar, multi-language support and even language translations.
Check out the Ask Ziggy website here for more info.
Via WPCentral