Since only one person responded regarding interest in a panel or round table on Lisp idioms, I'll just pass along Peter Norvig's "Tutorial on Good Lisp Programming Style" URL:

http://norvig.com/luv-slides.ps

There is also an excellent presentation of this topic in is PAIP book: http://www.powells.com/biblio/72-9781558601918-0

-Daniel -- first name at last name dot com