[kingkilr]

Rubinius is using it successfully though (I think anyways, does the Ruby community have benchmarking infrastructure?)

[pbiggar]

Yes. My impression is that it's the same kinda-sorta successfully as Unladen Swallow - pretty good, but nothing like LuaJIT2, V8 or SpiderMonkey.

[kingkilr]

Apparently PyPy still has work to do, we must insert ourselves into this list!