http://www.infoq.com/news/2007/07/worthless-code

This parallels my general take on code reuse...

Josh's 1st Axiom of Code Reuse

In order to be reusable, code must first be good.  Since most code is not good, most code is not reusable.  This means you.

Josh's 2nd Axiom of Code Reuse

Most of the time, idea reuse is infinitely more beneficial and productive than code reuse.

Josh's 3rd Axiom of Code Reuse

Most of the time, don't bother... it's not worth the trouble.