Basic Aspects of Squeak and Smalltalk-80 Programming Language - By Wolfgang Kreutzer. Very nice introduction. Shows how to use Squeak UI and start programming in Smalltalk. Text, code samples, many screenshots showing what to do, and how. - http://www.cosc.canterbury.ac.nz/wolfgang.kreutzer/cosc205/smalltalk1.html
Making Smalltalk with the Penguin - Series on object-oriented programming for users new to OO, or programming. Goal: introduce OO programming, and spread the fun of Smalltalking. Teaches Smalltalk generally by teaching Squeak. Text, code, screenshots. [Linux Gazette #51] - http://linuxgazette.net/issue51/steffler.html
Making Smalltalk: OO Thinking - Series on object-oriented programming for users new to OO, or programming. Text, code, screenshots. [Linux Gazette #65] - http://linuxgazette.net/issue65/steffler.html
Making Smalltalk: Spreading the OO Fun - Series on object-oriented programming for users new to OO, or programming. Text, code, screenshots. [Linux Gazette #59] - http://linuxgazette.net/issue59/steffler.html
Making Smalltalk: Objects, Classes and Other Things - Series on object-oriented programming for users new to OO, or programming. Text, code, screenshots. [Linux Gazette #60] - http://linuxgazette.net/issue60/steffler.html
Squeak Smalltalk: Basic Language Reference - By Andrew C. Greenberg, 1999; Andrew P. Black, 2001. Quick reference for Squeak user interface; helpful for Smalltalk generally. Text, many command tables, screenshots. - http://www.mucow.com/squeak-qref.html
Happy Squeaking - Tutorial. Text and code samples. Japanese, with many useful English words and links. By Masashi Umezawa, one of the translators to Japanese of Simon Lewis' The Art and Science of Smalltalk: Saku Saku Smalltalk. - http://www.ogis-ri.co.jp/otc/hiroba/technical/Squeak/squeak.html