Clojure has always intrigued me, but I've stuck with Scala so far so I don't scare any of the more Java inclined developers I work with when they read my code.

I keep thinking with Scala though, I'm going to run into some really awful looking code one day from someone overly abusing all of its features. I know know even the most restrictive languages can be abused, but it just feels like Scala leaves the window much more open for that.