And if you are lucky enough to be dealing with a functional javascript library like d3, you can even use cljs functions as arguments to your js library. This leads to very succinct and powerful interop.

For example:

  (.timer js/d3 (fn []
        (-> root (.selectAll "g") (.data curClockData)
            (.select "path")
            (.attr "class" #(str (:key %) (:which %))))
        ; return false to keep running
        false))))

This snippet does this twice to provide a longish function to the d3.timer call and a small inline one to attr to set a class based on the data in the selection. More context available: http://bl.ocks.org/4326896

ObTopic: cljs in cljs does sound dreamy. Would this also enable <script type="text/clojurescript">?