I don't, however, like the ecosystem surrounding it. I find Leiningen (while an excellent tool) far too heavy for the majority of my purposes. I much prefer other functional languages (e.g. OCaml, Haskell) that don't need such an intricate project structure.
With OCaml & Haskell, I can start with one source file in one directory and gradually build up to a more sophisticated layout as needed, rather than have a complicated layout imposed upon me by the project.
[1] http://clojuredocs.org/clojure_core/clojure.core/-%3E [2] http://clojuredocs.org/clojure_core/clojure.core/-%3E%3E