A Lisp programmer writes about Common Lisp techniques, SICP, Emacs, and managing eccentric programmers.
HN links it mainly for a Lisp solution to rounding up to the nearest power of two; commenters give no broader opinion.
Here is a mediocre lisper and an advanced lisper's take on the question (edit: and also another lisper's take, too):
http://lispy.wordpress.com/2007/11/02/my-solution-to-the-rounding-up-to-the-nearst-power-of-two/