It's finally arrived! MileBug for Windows Phone 7 is now in the Windows Marketplace and ready for download. And there's some fun features that are unique to WP7, too! Like live tiles! Create a favorite trip and put that trip on your home screen for an even quicker start.
WP7 also includes a 2-week free trial period. So go ahead and download it. It's free to try! Then two weeks after you log your first trip, just upgrade and you're good to go.
MileBug for Windows Phone 7 (Free trial, $2.99 upgrade)