Rich Hickey's Keynote from the JVM Languages Summit (video)

I admire Rich Hickey and Stuart Halloway and I've been reading the prag programmer book on Clojure, but I still haven't been able to wrap my head around why I should replace my preferred language - Ruby - with Clojure.<p>I understand that if I was building a database, or a traffic control system or something with lots of concurrency, it's useful.<p>But if I'm building a web app, the appserver and database handle the concurrency issues for me.<p>So I haven't quite understood why Clojure is so important.

A bit off-topic, but I've been seeing more infoq lately, and I'm wondering if there's a pwnyoutube/deturl type thing for infoq. I found the conclusion to Rich's talk on youtube, but it looked like it was filmed with a cell phone and it was only the last few minutes of the talk. Any pointers to a download link would be much appreciated.