[racket] Liitin screencast tutorial

On Mar 5, 2011, at 6:54 PM, Hendrik Boom wrote:

> One of the difficult aspect of life-long data accumulation is dealing 
> with data alrady accumulated before the new  system came into existence.

Starting about 10 years ago, I started formulating potential dissertation
topics like this: 

 here is a problem with reality 
 let's call a potential solution 'paradise'
 I want a dissertation that 
   (1) describes paradise and
   (2) describes a way to get from reality to paradise

Sam's Typed Racket and Carl's Modular Hygienic ACL2 are two examples of just
this kind of work. 

I think it helps a lot to take this perspective when it comes to a 
description of 'paradise'. In other words, the solution space changes 
with this constraint 

-- Matthias