SFLC has released a code analysis of the infamous ath5k driver in Linux. SFLC has also – in the aftermath of the OpenBSD-Team vs. Linux-Team ‘License Flame War’ – released a paper on what ‘copyrightable‘ means, as well as one on proper usage of non-GPL’ed code in GPL’ed projects. All as part of guidance for developers wishing to use permissive licensed code in GPL’ed projects.

Groklaw naturally also has a take on this.