I'd like to add that they don't yet take advantage of transit around the airport. Portland International is I assume pretty well connected into the public transportation grid (like most airports I know) and the TriMet link shows those routes clearly. Google's system shows me needing to walk 1/2 hour from the airport to catch the red line to Beaverton, however.

Airport connectivity should be a high priority for this system: business travelers, tourists, whoever is coming into a city for the first time would like to know how to get from the airport to their destination and <b>do not</b> know the good links (your TriMet link for example) that locals know to get them there. If google can give accurate info on picking up these routes, I think they can promote public transit to many people who would never use it in unfamiliar cities.

A hopeful thought...