I found one a few days ago before I got my Intel iMac. I can't remember where now. IIRC, it was something someone had downloaded source for and recompiled, not an official release. I'll see if I can find the link again.
EDIT: OK, I can't find the exact link anymore. There are experimental builds floating around, but none seem to work perfectly yet. Check
graphicall.org for builds (only works correctly in Firefox for some reason).