The app has been made possible due to the team at Invoke IT. The app goes a bit further by offering Bing search, text messaging and email options. However the video you see is the update for Sliding Keyboard. The app has been submitted for testing and will be available in the Marketplace soon.
You can download Sliding Keyboard for 1.29$ here
Update: We have a quick update for you. Developer Hermit Dave is hard at work and has submitted v1.8 to the marketplace. Here's the changelog from the developer himself
- changes to underlying dictionaries used.
- It also now supports localisation of keyboards and provides ability to translate text
Here's a quick video preview