Dynamically redefining classpath in Clojure REPL (here, via @jaceklaskowski) -- Ooooh! I didn't know you could do that! Can we get this into Lein/Cake/mvn? or is it already there? Basically you can dynamically add new .jar files into your classpath and use them right away.
First cut of align-cljlet. Let statement alignment for clojure & emacs. (here, via @gstamp) -- Pretty code is pretty.
It's getting better and better (here, via @vilsonvieira) -- The latest PDF of "Clojure in Small Pieces" has a lot of content in it. (Warning, that's one BIG file)
Wrote up some thoughts about different concurrency frameworks (here, via @puredanger) -- This is a good survey of the options that you have when dealing with highly concurrent systems. Worth a read, as when the level of concurrency is high enough, some solutions are better than others.
fs - File system utilities for Clojure: fs - file system utilities Clojure is out (and created a small debate :) (here, via @tebeka) -- A library for manipulating files and the file system from clojure at a similar level as you would to at the shell.