Common Lisp in Xcode

I am going to be learning Common Lisp as part of a programming project that I and another person are starting. Is there a Lisp plugin for Xcode 3?

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There are several implementations

Although I haven't programmed in Lisp, and I'm not sure about a Common Lisp plugin for Xcode, I do know that there are several implementations for the mac in which you may be interested.
e.g. there is Allegro Lisp which costs several hundred dollars, there is also an open source one called Clozure CL, and one called Ready Lisp (from New Artisans LLC) which is also free.
You can find quite some information by searching in google the words: common lisp mac.