I also recently blogged about how LISP can remove the cognitive friction of going from one domain to another and gave an example. For a much better and possibly more relevant example see the “parenscript-tutorial“, an excerpt of which follows:
(defun tutorial1 (req ent) (declare (ignore req ent)) (html (:html (:head (:title "ParenScript tutorial: 1st example")) (:body (:h1 "ParenScript tutorial: 1st example") (:p "Please click the link below." :br ((:a :href "#" :onclick (js-inline (alert "Hello World"))) "Hello World"))))))
So just like the SQL example given earlier, LISP is usable in every tier. What other language can do that?
Check out the ParenScript project which is very exciting.