Another piece of essential freeware for the global nomad - Métro - which I think lives up to its claim as being the ultimate public transport guide for your PDA or Smartphone...and its free!
I used this software on my P800 and I have installed the freshest version to my new P910. It came in handy when I was down in London and hopefully I'll get another opportunity to use it soon.
Basiscally, it gives you directions from one place to another... Its not GPS but works due to its knowledge of the public transport network in each location... I say "each location" out of trust as I have only used it in London.
Check it out: Link