So there’s not yet an option to take public transit on the iPhone’s google maps interface. What’s more, if you try to go to maps.google.com with mobile safari, it will kick you back into the native iPhone app. Damn… no public transit routing.
But wait!!! If you direct mobile safari to google.com/transit, you will be able to input your start and destination and get back text-based directions for your route. So until Mr. Google and Mr. Apple decide to integrate the public transport feature (maybe they haven’t because the feature is only available in select markets) into the iPhone’s google map interface, this is all you get. But hey, it gets you public transit schedules, directions, and routing.