Paul Graham seems to have a lot to say.
Go read it.
I'm not much of a lisp/scheme person, but everything he says seems to hit home, and as a result of reading his essays, I'm really looking forward to checking out Arc when it's ready for public consumption.
It's interesting to look at the differences between what He's doing with Arc, and what the Perl people are doing with Perl6. One is very much the cathedral style of design and implementation, while the other has everything, from the design of the language to the implementation of it's low level VM out in the open. I wonder which will take off?
Personally, I'm hoping for both, since there's more than enough room in the world for many languages, and both seem to have a lot of good ideas that are worth exploring.