I don't know about 15-30 minutes, but for anyone interested in learning Clojure, I have collected these links that I found interesting:

http://www.youtube.com/watch?v=Aoeav_T1ARU

http://blip.tv/clojure/clojure-for-java-programmers-1-of-2-9...

http://4clojure.com/

http://www.ibm.com/developerworks/podcast/ag/gloverseries-ha...

http://www.infoq.com/presentations/Value-Identity-State-Rich...

http://clojure.blip.tv/file/4824610/

http://clojure.blip.tv/file/4457042/

http://vimeo.com/11236603

http://www.infoq.com/presentations/Clojure-in-the-Field

Visit them roughly in order.

As for books, there are a few good ones, but I acutally recommend the documentation on clojure.org more than any book. It's clear and compact.