>This doesn't solve the general printing problem, since this is a 
>Mac-only solution, but it was a fun toy exercise.  (Exercise for the 
>Reader: In playing around, I found that BBedit does understand "send 
>postscript," so it shouldn't be hard to generate PostScript from 
>Squeak and print it through BBedit.)

It isn't hard at all, but to do so you need V5 or higher of BBEdit 
(the non-free one).  BBEdit Lite isn't scriptable beyond the core 
suite.