http://criticalmassrides.info - worldwide critical mass hub – many link to cm sites over the world
http://www.critical-mass.org
http://www.moz.net.nz/cmass - pictures from critical mass rides from Sydney
http://nccnsw.org.au/~cmass/index.shtml - home page of critical mass sydney
http://www.chicagocriticalmass.org/index.html - chicago ceritical mass
http://www.scorcher.org/sfcriticalmass - san fransisco critical mass