GPL?

Most of the people who read my blogs are probably aware that I am a bit anti-GPL, preferring MIT, BSD or Apache license (even for my own code).  At every company I work with (except Intel who flat out told us to not even read webpages about GPL code) we argue about what it takes to make a derivative work.  Does this count? Does that count?  It's no wonder, since two of the biggest GPL advocates don't even agree.