You can find details, listen to a few episodes on EduTalk, read the 106 bullet post that inspired the show and pick a bullet to write a bumper for at http://theds106shrink.tumblr.com/post/80870369356/colinpods-every-sunday-at-8-00-uk-time-check
A bumper is “a term used in the radio broadcasting industry to refer to short clips of signature or theme music used to buffer transitions between programming elements. Bumper music is commonly employed when a syndicated program takes a break for local station identification or ‘goes to a radio commercial.'” (http://en.wikipedia.org/wiki/Bumper_music)
It will take us a while to complete this project, it would be great if it could be something we can all do together to help people learn why DS106 is always a good spell!