OneBusAway for Windows Phone is an app for Windows Phone (WP) 7 and 8 devices with transit information for the Seattle, WA, Tampa, FL, and Atlanta, GA regions, and potentially any other region that sets up a OneBusAway server.
The latest stable release is available for download from the WP Marketplace.
Our source code has a dependency on the Silverlight Toolkit for WP7. Please install it and the project should build correctly: http://phone.codeplex.com/
OneBusAway for Windows Phone was originally hosted on CodePlex using Team Foundation Server. If you're looking for old material, you can find it here.