The high-resolution colour screens on modern Palms can free you from carrying maps around. Several companies make software that puts street maps and maps of the underground rail systems on the Palm in an eminently readable fashion. For London, the two main contenders are Westering's $20 (~AU$27) London Tube Guide and Street Map and Visual IT's Tube. Visual IT also makes underground railway and street maps for many other cities around the world -- Amsterdam, Toronto and Tyne&Wear, to name a few -- at prices varying from £7 to £14 (~AU$17 to $35).
London Tube Guide and Street Map: ditch those paper maps.
The street maps in Tube are much more detailed and covers all of Greater London, whereas the Westering product simplifies the street map so that many smaller streets are left out, and the map itself ends at the Circle Line. But Westering's user interface is better, making it easier to get the software to find routes and estimate travel times. However, Tube is a little more expensive: the underground map plus the full A-Z maps of Central and West London cost £16.49. The complete set of nine A-Z London maps plus the underground map cost a little over £30 (~AU$74).
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