Krugle gets an automatic win in my book because it seems to be the only one that can search Common Lisp code. On Google and Koders, setting lang=Lisp turns up

Krugle gets an automatic win in my book because it seems to be the only one that can search Common Lisp code. On Google and Koders, setting lang=Lisp turns up mostly Emacs Lisp, and "lang:cl" gives only Tcl code. (They distinguish between CL and Scheme, but not Elisp!) O'Reilly has no language selector, but searching for a Lisp symbol just turns up a lot of Emacs Lisp books. And Ucodit can't seem to find any Lisp code at all.