Language roundups: Scala, Clojure, Erlang

Pure cut and paste from here:
isthisclojure.blogspot.com/2010/02/language-roundups.html

I promised to do 15-25 bullets on Erlang, Clojure and Scala::

- tool chain: IDE/editors, debuggers, tracer, profiler, loggers, static code analysis;
- concurrency model: STM; persistency/ACID backends; message passing;

- developments on the VM and compiler choices;
- core language

Here's the initial promises:

Scala (kind of fluffy)
http://news.ycombinator.com/item?id=1150837

Clojure (pure fluff)
http://news.ycombinator.com/item?id=1086645

Erlang (folks seemed to like this one)
http://news.ycombinator.com/item?id=855290