I'm out on a limb here, but I hear a rumour that you should get in touch with them if the following sounds like you:
- know Processing inside out
 - can spare a couple of weeks (maybe it's your summer break from school or college?)
 - are interested in experimental graphics and typography
 - want to make art installations
 - want to enhance your portfolio and work with some cool people
 
Update: Jody and Luke have posted more details on the Processing Forum.