The bi-annual *Pro Walk Pro Bike* is the premier conference for everything walking- and cycling-related in North America.
Even if you weren't able to attend the 2012 conference in Long Beach, CA (alas, I am among that group), you can check out videos of keynote presenters and powerpoints from breakout sessions here: http://www.pps.org/pwpb2012/presentations/
I haven't watched it yet but the rousing keynote by Mark Gorton that closed the conference was apparently quite popular: video - http://www.pps.org/we-are-the-majority-the-cars-dont-vote/ presentation - http://rethinktheauto.org/national-presentation/
Note that the next PWPB conferencehttp://www.post-gazette.com/stories/local/neighborhoods-city/pittsburgh-to-host-international-bikingwalking-conference-in-2014-653219/takes place Sept 8-12, 2014, a little closer to home -- Pittsburgh.
cheers, Beth