Recently I got fed up with a couple of warts in swank-clojure, so I made a couple of small fixes, and that lead to a couple of new features. Using SLIME with Clojure has never been as smooth as using it with Common Lisp, and the lack of debug functionality beyond the display of stack traces is particularly onerous. Recently, George Jahad and Alex Osborne's debug-repl showed the possibility of adding a break macro to enter the debugger with the call stack intact and local variables visible. This functionality is now in swank-clojure.