Since EtherPad is no longer allowing new pads to be created, here are a couple alternatives (clones) we might try as a class:
http://ietherpad.com/
http://typewith.me/
In the past, we've tried these two with no success:
http://titanpad.com/
http://primarypad.com/
http://ietherpad.com/
http://typewith.me/
In the past, we've tried these two with no success:
http://titanpad.com/
http://primarypad.com/