Learningworks Smalltalk
It is unsupported and offered free for educational and training purposes. A software environment for delivering curriculum that incorporates student programming activities.

Smalltalk overview
A small reference guide to classes, methods, class groups, variables, block expressions and message expressions.

Applications Programming in Smalltalk-80(TM): How to use Model-View-Controller (MVC)
This paper originally described the MVC framework as it existed in Smalltalk-80 v2.

Squeak Online
Include the OOPSLA paper by Dan Ingalls Ted Kaehler John Maloney Scott Wallace Alan Kay.

Dolphin Smalltalk Tutorials
They are intended for those who already know the language and base classes and follow on from the Beginner's Guide. Guide you through the development of a number of sample applications in Dolphin Smalltalk.

IBM Smalltalk Tutorial
Focus will be placed on the parts of the language that are common to, and uniform across, all platforms. This tutorial is intended to be on the language itself, discussion of the development environment, compiler, editors, or debuggers will not be covered in great detail.

Smalltalk Textbook
AOKI Atsushi's Smalltalk Textbook in English.