Streetsblog (a NYC-centric blog that is a leading voice for livable urban streets)

Streetsfilms (jillions of videos of livable streets issues and examples from around the world)

Streetswiki (collection of reference articles written by the Livable Streets community. It's a place to share information about Livable Streets topics and people.)

BikePortland.org (a Portland, Oregon-centric blog that is relevant to rest of us)

League of American Bicyclists (National lobbying group for bicycling that organizes the annual Bike Summit on Capital Hill)

Thunderhead Alliance (National coalition of state and local bicycle and pedestrian advocacy organizations)

Walk Bike Berks (a firecracker start-up in Berks County, headed by Michele Barrett)