It’s been ready for a while now, but I don’t think we ever mentioned it, so…
Clozure CL 1.2 is now available.
Clozure CL is is an open source Common Lisp implementation that runs on PowerPC hardware under Mac OS X and Linux, and on x86-64 hardware under Mac OS X, Linux, and FreeBSD.
Clozure CL used be called OpenMCL. It is also sometimes called CCL.
You can get it here.
Release notes are included in the distribution, or here (the release notes URL has “trunk” in it, but those really are the correct notes).