Ahoy,
I added a hopefully nice feature: Lisp teaches Emacs how to indent macros. I found a way to do it without hacking Emacs's indentation code at all.
From now on when you have a macro like:
(defmacro foo (a b &body body) ...)
anywhere in your Lisp image, Emacs should know to indent calls as:
(foo ((x y)) (bar) (baz) (beer))
i.e. it groks &body.
Details and caveats are in the manual (and I put fresh versions in my ~/misc/lisp web directory). Feedback / tweak-suggestions appreciated.
-Luke