For residents of the US, 18 or older. Process: join the Bicycle group on Sierra Club's Climate Crossroads page; post a picture to the group's gallery; write a haiku about your bike and/or bike commuting and stick it in the "add a comment" section. The winner will be selected by Congressman Earl Blumenauer of Oregon, founder of the Congressional Bicycle Caucus. Deadline to enter is May 31 at noon PST. Detailed rules and criteria here. Runners up get a helmet and lock.