It all started in summer 2009 at HAR, a hacker camp in Holland.
user:fish did a small radio show at HAR FM from 10:00 till 11:00 every morning about hackerspaces.
When the idea of Signal was born we also had the idea to start the Hackerspace hour again.
And here we are!
 Show Notes
The official signal archive: http://signal.hackerspaces.org/archive/