Pure Clojure functions should have ^:pure metadata on them. The compiler could then infer fn purity based on calls in fn bodies. Crazy? (via @cemerick) -- That'd be cool.
Factual launches its own Developer Blog. Read the first post: "Thinking in Clojure for Java Programmers (Part 1)" (here, via @factualinc) -- Great article to send to your Java developer friends and coworkers, or to your boss, or to your spouse (so that she knows you're not crazy).
Free version IntelliJ 10 with Clojure: create new project from existing leinigen project, add jars in lib ---> nice free Clojure IDE. (via @mark_I_watson) -- Indeed, the "Community" version of IntelliJ IDEA 10 not only it is free, but you can use it for Clojure programming by installing the La Clojure plugin