For Java developers: case study of the utility of dynamic languages
As seen on Planet Lisp:
Joe Marshall's great writeup on the big wins from using Common Lisp to develop an application.
I do spend most of my time designing and writing Java applications, but I also believe in keeping an open mind about recognizing Java's weaknesses (mostly that it is not a dynamic language).
Ruby and Python are also dynamic languages, but lack the blazingly fast performance of natively compiled Common Lisp code.