The TclersWiki mailing list used to be found at http://groups.yahoo.com/group/tclerswiki . The idea was a place offline for discussions so that we didn't have to worry about multiple people editing the same page at the same time, keeping track of who says what, etc.
It was initially started as a place to discuss a replacement for the chat program. After we hit the wall (firewall that is) on that topic, the mailing list seemed to stalled.
At this point, the group is pretty quiet.