Another nice recent Squeak distribution is Cuis, which takes quite another approach, trying to slim down the system to its basics, going back to the SmallTalk roots. Looks quite interesting for those interested in learning stuff, and doesn't try to go the futile way of trying to emulate "normal" operating systems: http://www.jvuletich.org/Cuis/Index.html
The sooner they can get rid of all the horrible Squeak graphics the better. Was playing with Pharo last night and, unfortunately, it still doesn't take long to run into Squeak aesthetics.
Typical Smalltalk environments are interesting because the runtime and the development tools are very tightly integrated (or "coupled" depending on your point of view). This affects the way the development and debugging tools interact with programs. For example, you can change a program just by modifying elements of its UI while it's running.
For a Smalltalk without a graphical environment by default, try GNU Smalltalk: http://smalltalk.gnu.org/
Maybe it's targeted at people who like to write unshippable software. But seriously, I think Apple only forbids shipping something called an interpreter or an interpreter that loads code over the Net.