Hiho,
I've drafted a user manual in doc/slime.texi. It's also online at
http://www.bluetail.com/~luke/misc/lisp/slime.ps.gz http://www.bluetail.com/~luke/misc/lisp/slime.pdf
The PDF version is a bit ugly (from ps2pdf), because texi2pdf is choking on slime.texi for some reason.
Feedback would be welcome, so please RTFM!
Cheers, Luke