I am curious what qualifies as true CPU concurrency vs. threading tricks/shortcuts in the implementation of a language. If you look at java-6, c++, pascal, c, and ocaml, those are the top performers that actually utilize all 4 cores, where as haskell and erlang use 100% of one CPU. Also, in the interesting alternative programs section, the top performer is java (by cheating that they mention Haskell probably does behind the scenes)