Patent Medicine for Text Editing Dinosaurs

I've finally dusted off my Emacs initialization files for the first time in a long time, mostly so I can integrate my brand spankin' new Lisp environments into Emacs with SLIME to get a better editor than most of their IDEs include. Now I can dump all this ILISP hackery, and clean out some other cruft that's been accumulating since the Early Mezozoic Era.

One question I have is how to configure SLIME to support multiple Lisps. That is, I don't want to define inferior-lisp-program to be just one of Allegro CL, CLISP, Corman Lisp, or LispWorks; I want to be able to invoke SLIME and chose what Lisp I want it to talk to. Ideally, I can launch multiple SLIME interfaction buffers, each connected to a different Lisp, and then eval a Lisp source code buffer in the currently active SLIME interaction buffer.

A real quick look at the SLIME 1.0 beta PDF manual didn't net me anything, nor did some cursory Lisp blog Google searches. I'm sure someone's already done this, so if so, give me a shout. Oh, and I'm running on Windows XP.