Clojure runs on the JVM. If there is one thing the JVM has to much of it's application servers. Jetty(non blocking), Glassfish for enterprise apps. Tomcat, websphere, weblogic, apache geronimo...etc. Why not just conform to those standards and make the clojure applications deploy to them. What is the advantage of this server over jetty?
I've implemented servlet-based solutions with Clojure on top of Tomcat (e.g. at <a href="http://elev.at" rel="nofollow">http://elev.at</a>), and although it wasn't too bad, there is still cruft to deal with. This looks like an interesting option indeed.