pdf 10 pages
http://www.eli.sdsu.edu/courses/spring01/cs635/readingSmallt...
http://amber-lang.net/learn.html
It's actually running in your browser, and the whole thing is a live coding environment in disguise. Well worth a play.
Edit: turns out, I should've looked more closely. You're supposed to select particular text before pressing the button. If you do this it works. Still, they might want to consider a more friendly error message ;)
It implemented Smalltalk primitives in JavaScript so it can run a real, bit identical, Squeak image.
http://stephane.ducasse.free.fr/FreeBooks/BlueBook/Bluebook....
Also available for $1.89 (plus shipping) used from Amazon:
http://www.amazon.com/Smalltalk-80-Language-Adele-Goldberg/d...