Squeak Goodies Some small goodies from Visoracle for the time after you get started with the above links.
Squeak How To? Answers to specific problems and questions taken from the mailing list.
Official
Squeak.org The official site and the central starting point for an exploration of the worlds of Squeak.
Squeak Wiki Main source of documentation and links. This is a wiki, meaning everyone can contribute and edit pages through a web interface. An open source community can dynamically communicate through such a wiki. On the other hand information is in many cases somewhat unordered, outdated or incomplete. A future plan may appear as actually implemented or a single person's opinion may be formulated as if it were a consensus of the community. So keep in mind that you have to read and think between the lines.
Squeak Mailing List The Squeakers communicate and coordinate their work mainly through this mailing list. You can browse the archive or subscribe to the list.
Squeak Beginners Mailing List To lower the barrier of entry the Squeak community has created this special list for beginners to Squeak. All kinds of questions a beginner may have are welcome!
Squeak Download Central download page with direct links to the current versions for all OS platforms.
External
Squeak by example Probably the most current introduction to Squeak for developers, available as a softcover book and as a free printable PDF to download. It should be noted that this is neither a book for learning to program in general nor is it a comprehensive guide for programming with Smalltalk. Instead the book is a bit skewed towards describing the IDE and aspects interesting to researchers discussing abstract software development principles or trying out new concepts. Things like SUnit Tests or the experimental language extension Traits of Squeak 3.9 are for example introduced before the basic Smalltalk classes and their hierarchy are explained and one of the three main chapters, called "Advanced Squeak", deals only with its Metaclass hierarchy. However, the book is a good start to get acquainted with the Squeak IDE and to some extent to the language Smalltalk.
Squeak Help A beginners guide to Squeak and its environment. This link is also a documentation about something that is not Squeak's strength - its documentation. So far the community didn't manage to come up with a complete manual for the beginner and the expert. Maarten Maartensz's Squeak Help is a step into the right direction and it is likely still the fastest way to grok the peculiarities of Squeak.