Since this discussion came before, here are some useful pointers from 
the last round (all of which I believe are still applicable):

Daniel proposing to integrate flow:
http://lists.squeakfoundation.org/pipermail/squeakfoundation/2002-November/000599.html

A summary of the open questions for flow:
http://lists.squeakfoundation.org/pipermail/squeakfoundation/2002-November/000634.html

But (to me) the bottom line is still here:
http://lists.squeakfoundation.org/pipermail/squeakfoundation/2002-November/000635.html

As far as I can tell nothing has changed in the meantime, so rather than 
rehashing all the arguments over, it might be worthwhile to read the 
above threads.

Cheers,
   - Andreas