On the official page the regulations are laid out: "The only rule for 30 Days of Biking is that you bike every day for 30 days--around the block, 20 miles to work, whatever suits you--then tweet about your adventures with the tag #30daysofbiking. Event starts on April 1 and ends on April 30!"
You can follow global progress on Twitter. Also check out a great video by Mindcaster, made in honor of the event.
And of course don't forget to visit the official blog.
