This guy's trying to write one in Movitz:

http://www.emmett.ca/~sabetts/

I'm not sure if you're joking. It has always been the case that you could run Lisp on stock hardware. Lisp machines were just an optimization for back in the day when hardware was slow and Lisp compilation techniques weren't well-known.

I didn't bring up Lisp machines. I'd like to see a Lisp OS of some kind, though.