Metro is a network calculator of (almost) all the subways and buses in the main cities around the world (around 200 at this date)! It is the only public transportation calculator taking into account the specificities of the metro in Paris and of almost all the undergrounds of the world. The networks are updated on a regular basis.
There is a feature letting you "link" a contact to a subway station!
You can update your networks online if you have an internet connection available on your Pocket PC (modem or cradle).
Metro is highlighting the interesting places which are really convenient for tourists.
A Must Have!