Hey, I wrote the Pivotal Labs podcast and code you mentioned above. While we do use some Clojure(script) in Tracker, it's only used for testing in combination with Test.Check. I personally think that calling that "production" use is a bit of the stretch, but it is certainly an example of useful Clojure usage in the wild!
It's a combination of a list of articles on Clojure usage I have stashed away + conference talks + job ads + some of the companies Cognitect has worked with (there are others we're not allowed to mention). I plan to put up a list like this on clojure.org soon.
- Walmart Labs - http://jobs.walmart.com/san-bruno/ecommerce/mobile-instore-s...
- Staples - http://careers.staples.com/sanmateo/
- Climate Corp (now owned by Monsanto) - https://github.com/TheClimateCorporation
- RoomKey http://www.colinsteele.org/post/27929539434/60-000-growth-in...
- Puppet Labs - http://puppetlabs.com/blog/new-era-application-services-pupp...
- Soundcloud - http://blog.josephwilk.net/clojure/building-clojure-services...
- Netflix - https://speakerdeck.com/daveray/clojure-at-netflix
- eBay - https://www.linkedin.com/jobs2/view/26386571
- Two Sigma - https://www.youtube.com/watch?v=YHctJMUG8bI
- Consumer Reports - http://www.meetup.com/denofclojure/messages/boards/thread/47...
- LivingSocial - https://www.linkedin.com/jobs2/view/19995533
- Factual
- Thoughtworks - http://thoughtworks.github.io/p2/issue09/two-months-early/
- Daily Mail - http://www.pitheringabout.com/?p=1018
- MixRadio - http://dev.mixrad.io/blog/2014/10/19/Clojure-libraries/
- Prismatic - http://blog.getprismatic.com/blog/2013/1/14/bringing-functio...
- Pivotal Labs - http://www.pivotaltracker.com/community/tracker-blog/generat...
- Beanstalk - http://blog.beanstalkapp.com/post/23998022427/beanstalk-cloj...
- uSwitch
- CFPB (Credit Financial Protection Bureau) - https://cfpb.github.io/articles/seeking-clojure-developers-t...
- Braintree Payments - https://speakerdeck.com/davidpick/building-a-data-pipeline-w...
- Outpace
- ViaSat / Lonocloud
- 8th Light
- Main Street Genome
- FarmLogs
- nilenso
- BrickAlloy
- Mastodon C
- Nubank
- Democracy Works
- World Singles
- Sonian
- Vital Reactor - https://www.youtube.com/watch?v=yroKdhAt8as
- DiligenceEngine - http://blog.diligenceengine.com/2014/08/12/were-hiring-for-t...
- IB5k - https://groups.google.com/d/msg/clojure/XMKe4v7k5g8/Hao7TuFb...
- Listora - https://github.com/listora
- BUGS Bioscience - https://www.linkedin.com/jobs2/view/11032601
- Cognitect and Datomic of course :)