I made a Unity3D introduction screencast. We create a 3D Ping Pong in less than 40 minutes.
Play the game in your browser: http://timmlotter.com/files/Unity3DIntroduction_3DPingPong/WebBuild.html
Browse the source code: https://github.com/timmlotter/Unity3DIntroduction_3DPingPong
Watch the screencast: