my environment:
MacOSX SnowLeopard
Cocoa Emacs 23.2
SBCL 1.0.51.0-a546163
Slime latest (I think...)

The installation of sbcl is fine.  I can launch sbcl in terminal.
But when launching slime in Emacs, it give an error 

Searching for program: no such file or directory, sbcl

Can anyone tell my what's wrong with my setting?

in .emacs file, I have written the following.
;;-------------
(setq inferior-lisp-program "/usr/local/bin/sbcl --noinform")
(setq slime-lisp-implementations
      '((sbcl ("sbcl") :coding-system utf-8-unix)
(cmucl ("cmucl") :coding-system iso-latin-1-unix)))
(add-to-list 'load-path "~/.emacs.d/slime")
(add-hook 'lisp-mode-hook (lambda ()
                            (slime-mode t)
                            (show-paren-mode)))
(require 'slime) 
(slime-setup) 
;;-----------

Thanks in advance,

soichi