I couldn't agree with this more. The point isn't so much that what it brings to the table is new - but that it packages all these features in such an accessible way:

* lockless concurrency

* syntactical support for data structures a la Python/Ruby

* macros

* polymorphism and inheritance

* functional programming

All this and the core language is defined in only 4500 or so lines of Clojure.

The Clojure-in-Clojure project is really something to look forward to.