One of the major complaints of the newly released Apple Maps is that it doesn't have transit directions.
I don't have an Apple smartphone so I'm not sure how well this solution works but Simon Maddox has created an app that provides Google Maps transit directions for those Apple users who have updated to iOS6.
Apple users can use the app to request transit directions and then Google Maps will open in Safari on their phone with the appropriate directions. The code for the app is available here on GitHub.
Obviously this doesn't work as well as having a map service that actually provides built in transit directions but it seems a much better solution than Apple's recommendation that users download lots of different transit apps for eveywhere that they need to use public transit.