I started writing one of those (hopefully) big picture docs, talking about how 
code is represented in Squeak, at -
http://minnow.cc.gatech.edu/squeak.658

It and one of the links from it are done for now and I'd be happy to hear and 
comments, problems and so forth, before I continue.

Just one exception - spelling and other trivial corrections are probably 
easier to apply than to report. Be lazy.

Daniel Vainsencher