BTW, if you work on OS X, and you want to get a good "IDE like" Common Lisp environment setup quickly, just install Clozure Common Lisp from Apple's AppStore (free), install Quicklisp, and set an alias like:

alias ClozureCL='/Applications/Clozure\ CL.app/Contents/MacOS/dx86cl64 &'

so you can quickly start the IDE in any directory.