Just started playing with Clojure, and must say I'm really enjoying the 4Clojure site - big thanks to the authors!
One thing I have observed - bug report time - is that the ordering of the tests is a bit weird. I've just done the "Simple Recursion" koan (id 57), and the next test I'm being offered is "Function Composition" (id 58), and the back option is "Sum it All Up" (id 24). This means jumping from Elementary to Medium, or back to Easy... I've noticed this is quite a lot of the tests, again not a huge problem, but definitely not correct.
Or is this some kind of weird Lispy humour thing that I'll understand when I've got a bit more experience under my belt?