I've been using your improved cond for years now and find it indispensable. I tried to convince the collective to at least add the :let clause to core's cond, but the working patch has been languishing on the ticket pile. So I continue to use your version (actually an older version than the extensible one in this library) in my own code. But that makes the code somewhat less portable. Would you consider uploading to clojars so that more people can easily jump in on the cond goodness?