Books on Smalltalk abound. All describe dialects that vary somehow from Squeak. The oldest books may be best since they describe the roots from which Squeak grows.
note - all of these are already in Introductions to Squeak>Smalltalk books
Websites for classes using Squeak. Examples: assignments, tutorials, cases, etc.
ullihttp://pbl.cc.gatech.edu/cs2390/1.html – the main class website. Lots of stuff here – over 75 fully worked out and documented Squeak programs. -sorry dead link-