David Lichteblau has an implementation of Franz' Emacs-Lisp-Interface (ELI) for SBCL: http://www.rz.fhtw-berlin.de/~lichtebl/lep.tar.gz

ELI is like ilisp, but a lot better (two way communication between lisp and emacs, support for threads, rarely gets confused, and more).

(A while back, Douglas Crosher wrote some support for ELI for CMUCL.)