Jonathan Coupe wrote:
> 
> I've been told that Parc in the classic days it had its own text editor - a
> sort of Smalltalkers emacs. Is this true? If so, I'd be grateful if could
> someone tell me its name, and suggest any sources of information I could
> access about it - especially the interface details.
> 
> I'd also love to hear about any other classic Parc apps - I'm researching
> ThingLab, obviously. I want to try and find out as much as possible about
> Gui design as it was before it got polluted by the big guys.
> 
> I know this isn't narrowly a Squeak issue, but I do think it's extremely
> relevant to Squeak's attempt to return to Smalltalks original values.
> 
> Jonathan Coupe

The Thinglab paper is here:
http://www.2share.com/thinglab/ThingLab%20-%20index.html
 
This and many more great historic papers are also available from PARC.
http://www.parc.xerox.com/publications/pubs-hst.html
You can download some of the papers and they will are willing to send 
many of the rest of the papers for free.

I recommend checking out:

Thing-Lab -- A Constraint-Oriented Simulation Laboratory 
  Alan H. Borning 
  July 1979 

UNIX Needs A True Integrated Environment: CASE Closed
  Mark Weiser, L. Peter Deutsch and Peter B. Kessler 
  January 1989 

Requirements for an Experimental Programming Environment
  L. Peter Deutsch and Edward Taft 
  June 1982 

Methods for Teaching the Programming Language Smalltalk: Smalltalk in
the Classroom 
  Adele J. Goldberg 
  June 1977 

Smalltalk-72 Instruction Manual
  Adele J. Goldberg and Alan C. Kay, editors
  March 1976 (Includes addendum dated June 22, 1976) 

Personal Dynamic Media 
  Learning Research Group 
  March 1975 (Although my copy says March 1976.)

The Cedar Programming Environment: A Midterm Report and Examination 
  Warren Teitelman 
  June 1984

The Interlisp-D Group Papers on Interlisp-D 
  September 1980, revised 


Another resource that you may want to investigate is
http://www.uvc.com/videos/01Kay.video.html
This is an amazing demonstration.  The section on Grail alone is worth
the price the price of the tape!