The boot.lisp available here:
includes my single method interface implementor class
implementaton, as well as a couple of bug fixes
documented elsewhere, some optimisations, mostly
relying on (first nil) => nil, and a couple of changes to
documented Lisp or DotLisp behaviour, the most
significant being that (reduce f nil) does not call f.
The ExtractIcons.lisp example uses this feature to sort
the ListView by various columns.