Catch the London underground with Google
google-latlong.blogspot.com
google-latlong.blogspot.com
http://googlemobile.blogspot.com/2011/07/download-map-area-a...
For cities that provide the information to Google, Maps includes realtime delays and closures.
http://googlemobile.blogspot.com/2011/06/know-when-your-bus-...
http://www.wired.co.uk/news/archive/2010-11/03/railtrack-ope...
http://mocko.org.uk/b/2011/01/08/open-uk-rail-data-media-cov...
Apologies for the bile the situation regarding access to UK Rail Network data gets me really irritated.
..In terms of crappiness.
I probably go to London at least ten times a month (either for a day or just for an evening), and have slightly more network rail trips a month (all my trips to london are an hour away by train), and in my experience I have much more trust for TFL.
http://www.tfl.gov.uk/tfl/gettingaround/maps/buses/busdiagra...
I'm using the tube less and less every weekend now that I now how to go from one place to another without needing to memorise it.
Incidentally, there was a cool iPhone app called TubeMap that made travelling on the tube a breeze when I was there last which included service downtimes which are apparently quite common, worked fine offline and was pretty fully featured in all ways you could want. However, the Tube is only a small part of the public transport for greater London.
I think they are very concerned that the data feed will be bad or unreliable, and that they will be providing bad directions. I know in NYC, the schedule and such for subways is generally simple, but has crazy exception rules every weekend for maintenance.
Moreover appears prone to suggesting some peculiar routes: http://bit.ly/qNyvHb
On the weekend I prefer to catch buses over the underground (no pun intended) even if it takes a bit longer.
I'm not in a rush and I enjoy the scenery (the front top seat of a double deck bus is a very cheap VIP way to tour London).
I'd probably use that route.
http://itunes.apple.com/gb/app/london-transport/id393119892?...
It was a little quirky (the bus arrival times seemed to be off a bit), but overall quite nice. It includes all forms of transport (bus, tube, DLR, ferry, and even Boris's bikes), lets your limit your travel options to just certain types (e.g., "I only want to see bus routes right now"), and has nice heuristics like whether you prefer to walk, how fast a walker you are, etc.