(1) simple, declarative project descriptions in clojure (2) straightforward swanking (3) dependency resolution e.g., $ lein new scratch/itch $ cd itch

(1) simple, declarative project descriptions in clojure (2) straightforward swanking (3) dependency resolution e.g., $ lein new scratch/itch $ cd itch $ emacs project.clj ... // add swank-clojure deps $ cat project.clj (defproject scratch/itch "1.0.0-SNAPSHOT" :description "FIXME: write" :dev-dependencies [[swank-clojure "1.2.1"]] :dependencies [[org.clojure/clojure "1.1.0-master-SNAPSHOT"] [org.clojure/clojure-contrib "1.0-SNAPSHOT"]] ) $ lein deps $ lein swank user=> Connection opened on local port 4005 #<ServerSocket ServerSocket[addr=localhost/127.0.0.1,port=0,localport=4005]>