[barendt]

Really minor nitpick - I think Matz claimed that about 30% of his prior RubyConf predictions were false, so about 70% of his prior RubyConf ideas eventually did make it to production.

[TheRubyist]

From 3 features he presented (Concurency, JIT, Soft Typing) I would put 5 $ on JIT, rest is pretty much against his philosophy.