Yes, but its not the features per se that make Clojure and Racket different from CL; any feature in these languages can be tacked on top of CL fairly easily by

Yes, but its not the features per se that make Clojure and Racket different from CL; any feature in these languages can be tacked on top of CL fairly easily by a half-decent hacker. What makes these languages different is their vibrant communities. I do hope they get faster implementations out sometime :) (and allow people the freedom they've been used to in the CL world).