Learning Clojure:

The best concise intro I've come across: http://en.wikibooks.org/wiki/Learning_Clojure

You can't go wrong starting with the introductory stuff on the site: http://clojure.org/rationale

This looks like a good longer intro, but I haven't more than glanced at it: http://java.ociweb.com/mark/clojure/article.html

A longer Wikibook: http://en.wikibooks.org/wiki/Clojure_Programming

Monad tutorial (site currently broken): http://onclojure.com/2009/03/05/a-monad-tutorial-for-clojure...

And there's one Clojure v 1.0 book out, only $20 for the ebook version: http://www.pragprog.com/titles/shcloj/programming-clojure

(Note that a whole lot of learning material assumes you're coming from a Java background ... which I'm not (in fact, I learned MACLISP before C and never had a chance to go beyond C++ to C# or Java).)

Setting up your EMACS Clojure development environment (VIM and various IDEs are also supported): http://incanter-blog.org/2009/12/20/getting-started/ and http://lisp-book.org/contents/ch18.html

And there are a bunch of videos, Rich Hickey does them well; note that most of the quotes below are from someone else that I then cut and pasted into my TODO file for future reference:

Clojure for Lisp Programmers Part 1 of 2: http://blip.tv/file/1313398

Part 1 of a presentation by Rich Hickey at the Boston Lisp meeting. A fairly extensive introduction to Clojure, with a presumption of prior knowledge of Lisp. Transcript available at: http://clojure.googlegroups.com/web/clojure-for-lispers-tran...

Clojure for Java Programmers - 1 of 2: http://blip.tv/file/982823

Part 1 of a presentation by Rich Hickey to the NYC Java Study Group. A gentle introduction to Clojure, part 1 focuses on reader syntax, core data structures, code-as-data, evaluation, special operators, functions, macros and sequences. No prior exposure to Lisp is presumed.

Persistent Data Structures and Managed References: http://www.infoq.com/presentations/Value-Identity-State-Rich... (very good).

Clojure Concurrency: http://blip.tv/file/812787

A presentation by Rich Hickey to the Western Mass. Developers Group on Clojure and concurrency. Brief overview of Clojure, discussion of concurrency issues, locking, and immutabiity. In-depth look at Clojure's refs, transactions and agents. Demonstration and review of code for a multithreaded ant colony simulation.

Clojure Sequences: http://blip.tv/file/734409

An informal introductory talk/screencast covering Clojure's sequences by Rich Hickey, the author of Clojure. Covers the motivation behind sequences, their relationship to cons, iterators/enumerators and collections, the sequence library, and laziness.

Clojure Data Structures - Part 1: http://blip.tv/file/707974

Part 1 of an informal introductory talk/screencast covering Clojure's data structures by Rich Hickey, the author of Clojure. Covers numbers, symbols, keywords, lists, vectors and maps.

At the 2008 JVM Language Summit he gave a talk, at the 2009 a keynote, "Are We There Yet?": http://www.infoq.com/presentations/Are-We-There-Yet-Rich-Hic...

Check Infoq for other items as well.