A couple days ago, Microsoft certified Walk-Run-Bike-Drive for the North American Marketplace. The app is being re-submitted for the World-Wide marketplace. Since it takes longer for World-Wide certification, I decided to go the two-step approach.
You can try a free trial from the marketplace using this link: http://windowsphone.com/s?appid=395e46dc-09dd-4fcb-b8cb-bf9c826ec7ea
For a complete description with screen shots and a video, look at the app website: