Bozhidar Batsov’s talk at the conj is about CIDER, which is the Clojure IDE and REPL built into Emacs. You should know that previously, the CIDER project was known as nrepl.el and it replaces SLIME, which is what we used to use in Emacs. CIDER connects to an nREPL server.
Why it matters
Emacs with CIDER is the most popular IDE according to the 2013 State of Clojure Survey. Bozhidar Batsov took over the project one year ago and CIDER has added many new features. I will enjoy hearing about all the things I don’t use because I don’t know about them.