For those who didn't see it on Slashdot, here is a good discussion of open source/free software licenses, from Mark Webbink, Senior Vice President and General Counsel of Red Hat. He is a lawyer, and this article is written for lawyers, but is clear and straightforward.
http://www.groklaw.net/article.php?story=20031231092027900 Ian -- license-discuss archive is at http://crynwr.com/cgi-bin/ezmlm-cgi?3