Erjang is a virtual machine for Erlang, which runs on Java™.
If you just want to try it out, do this:
curl -O http://dl.dropbox.com/u/1360473/erjang-r13b04-20110524.jar && java -jar erjang-r13b04-20110524.jar
It loads Erlang's binary .beam file format, converts it into Java's .class file format, and loads it into the JVM.
Good question. Well, I just wanted to learn Erlang, and it seems to be working!:)