Depends on what you want to know of course but I'm more interested in what people would prefer to use. I'd imagine that many people are still using Java and I wonder how many would prefer to switch.
For me, I use Scala at work now but I'd prefer to use Clojure. Probably an even better poll would be what do you use and what would you prefer to use.
I've met a lot of people who like and use groovy and have it in production but almost nobody who actively uses clojure or scala. Maybe I am biased by my social circle or maybe people are just answering the poll based on what language they think is coolest and not the one they actually use.