I wrote a paper on how I use Squeak to teach UI (with a little on how 
we use the CoWeb), including some empirical evidence on how the new 
Squeak-based approach has improved student performance on MVC. 
Basically, the idea is to build a UI toolkit from scratch, polling 
Sensor and writing to Display -- an approach which is near impossible 
in most other environments, and which seems to result in better 
student learning.

The paper was submitted to ACM's SIGCSE 2000 conference, and this 
version will be a GVU TR, #GIT-GVU-00-17.  FYI, the paper is 
available at:
http://guzdial.cc.gatech.edu/papers/sigcse00/sigcse-squeak.pdf
http://guzdial.cc.gatech.edu/papers/sigcse00/sigcse-squeak.ps

Mark
--------------------------
Mark Guzdial : Georgia Tech : College of Computing : Atlanta, GA 30332-0280
Associate Professor - Learning Sciences & Technologies.
Collaborative Software Lab - http://coweb.cc.gatech.edu/csl/
(404) 894-5618 : Fax (404) 894-0673 : guzdial at cc.gatech.edu
http://www.cc.gatech.edu/gvu/people/Faculty/Mark.Guzdial.html