[skardan]

I also recommend Rich's talk called hammock-driven development

http://blip.tv/clojure/hammock-driven-development-4475586

http://www.popscreen.com/v/5WwVV/Hammockdriven-Development

or his recent talks about reducers or Datomic.

For me the talk about reducers was especially jaw-dropping experience because it was about something simple we all do every day - crunching data in collections (how many times you have implemented lists library? :). Yet after decades of collection traversing, there is a still a place for fresh approach, if you are willing to thing hard.

This is the difference between blindly following known programming patterns (cargo-cult programming I would say) and really thinking about a design.