Portland TriMet just launched their new site using OpenTripPlanner: http://ride.trimet.org/ Looking forward to seeing this in other cities and on the iPhone!
Can you not just create a shortcut to launch google maps in the browser?
it's not the maps that are a problem, it's the transit directions, but besides that, maps in a web view are painfully slow at best.
The mobile web version of Google Maps still doesn’t have retina graphics, so it looks very ugly on most iOS devices.