This is the best free software I found for my Palm: click here
I used it all the time when I was in Paris - you tap on which Metro station you're at and which one you want and it tells you which line, where to change, how long it will take etc. Absolutely brilliant. You can download hundreds of cities, including London & Tokyo.
I found this and a lot of other freebies at palmgear.com - I have local tide tables, phases of the moon, religious and national holidays and a scientific calculator.
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