I think Clojure might succeed even without its great concurrency features - and by succeed I mean gaining a Porsche-like marketshare.

It has all the good Lisp stuff, but ditches all the historical Lisp cruft, actually has a little syntax. And because it runs on the JVM, it's stable, fast, debuggable, has a wealth of libraries and runs on Windows, Mac and Linux.

And there's already a (beta) book: http://pragprog.com/titles/shcloj/programming-clojure