Métro is your free guide on PDA to public transport systems (buses,metro,tram,trains). 400 cities are covered now worldwide: http://metro.nanika.net/MetroV-en.html .
One of the most successful travel programs available for handheld computers worldwide.
5 languages: japanese, french, english, german, chinese.
Use it to plan journeys, guide you between subway and railway stations, or to help you find places of interest such as museums or government buildings. More Info »
For such a small application, it holds a surprising amount of details and with frequent updates, you don’t need to worry about out-of-date information.