For the best, most up to date, relevant planning and development information on the web, forum.skyscraper.com is hard to beat. There are some very smart, and very thoughtful people on the forums there. My hat is off to 'arkhitektor' for producing this very fine diagram:
Transit maps really need to be done at two scales-- a diagrammatic 'system map', and a scaled 'station area map'. Trying to do both with a single image has serious problems for either purpose.