Clojure for Lisp Programmers

http://blip.tv/clojure/clojure-for-lisp-programmers-part-1-1319721
http://blip.tv/clojure/clojure-for-lisp-programmers-part-2-1319826

It's a great talk. I've seen many people on /prog/ groundlessly criticizing Clojure, and it's sad. It this presentation Rich Hickey addresses all their points and provides a coherent rationale behind Clojure and its various ``unusual" design decisions. Despite being quite lengthy it doesn't get tedious as it quickly jumps from topic to topic, sometimes with interesting questions form the crowd between the jumps. You should definitely watch this video before forming your opinion about Clojure.

>>11
What?
Here is example from wikipedia
why it returns 1?

* $ sbcl
This is SBCL 1.0.11.debian, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>;.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and COPYING files in the
distribution for more information.
* (defparameter x 0)

X
* (defun f () x)

F
* (defun g () (let ((x 1)) (f)))

G
* (g)

1
*