I've been looking up articles on taking public transportation with kids to prepare for a trip, and this one seems like it has pretty good tips and advice. Some of the things I just never would have thought of, even though they are common sense.

www.parentzing.com

It's also funny in a tongue-in-cheek sort of way.

i also found a good post on www.travelwithyourkids.com although the first post is more comprehensive (and funnier to read).

Any other suggestions?