I guess, Rubinius is no longer relevant? I remember it was a very promising project back in 2008.
It's very relevant, and very active.
EDIT: Just checked. If you `rvm install rbx`, you get code written today.
Every commit is a release of rbx. Yay continuous integration!
That said, there hasn't been a numbered release in a while, through there will be a 2.0.
The Rubinius 2.0 preview release came out in June 2011: http://rubini.us/2011/06/07/inside-rubinius-20-preview/