Tim Bray tonight:

I think the concurrency problem is pretty well solved for one class of application: the Web server and most of what runs in it.

And coincidentally, a new web framework that aims to help you saturate those cores, from my pal Evan Miller:

You will write clean, synchronous, sequential code. Chicago Boss takes care of the rest.

This strikes me as the reason my web dev friends don't get very excited about the current crop of concurrency focused languages. The framework takes care of all that! Which is great!

When you aren't riding the HTML highway though, I'd definitely recommend checking out Clojure. There's been an upswing in interest in my circles lately - Programming Clojure's fantastic, the community is lively and Rich Hickey appears to be a genius.