Look how old this is! I post at SearchCommander.com now, and this post was published 17 years 5 months 9 days ago. This industry changes FAST, so blindly following the advice here *may not* be a good idea! If you're at all unsure, feel free to hit me up on Twitter and ask.
My city Portland is included as one of the cities for planning your public transportation trip in the new Google Transit section.
Only a few cities from nine states (California, Florida, Hawaii, Minnesota, Nevada, Oregon, Pennsylvania, Texas and Washington) are included at this time, but all regional and national railroad, all domestic airlines and even fairies are included in Japan, which gives you a good idea of where this is going.
check out http://www.hopstop.com they cover the big cities where transit is really used. Hopstop is the best site ive everused for getting around using mass transit.