Martin Fowler has made a cool discovery, Stef's Free Online Smalltalk Books. These are Smalltalk books that are out-of-print, but you can download them for free.
Speaking of which, I wonder how long my first book, The Design Patterns Smalltalk Companion, will remain in print. According to my royalty statements, it's still selling, and has sold over 4700 copies. The publisher only printed 5000 copies, and has probably given away about 100 copies, so there are probably only about 100 copies left. After that, the publisher may not want to print anymore copies, so the book will go out of print. Then maybe it'll end up on Stef's site.
Downloadable Smalltalk Books