I'd really love to see SBCL or CMUCL ported to Windows, with the full set of functionality. -- Dave Roberts, Reddit and Lisp Psychosis
Alastair Bridgewater has been working on his Windows port of SBCL again, this time to clean it up and forward-port to 0.9.6 (the original work was done on 0.8.9, which is almost 2 years old). This isn't exactly the full set of functionality, but the port is functional enough to compile itself.
Update 2006-01-04: See Christophe's blog for the current status of the port.