Having recently become interested in the GNU Free Documentation License (GFDL), I followed the link to the organization that runs it, the Free Software Foundation. I figured maybe they would be interested in hearing about how Wikipedia systematically violates the GFDL.
However, a quick scan of the FSF site tells me that they are into some shady stuff themselves. The FSF is involved in campaigns, for example, to prevent the adoption of Windows Vista.
Whatever one might think of Microsoft, I think this is yet another reason to think twice before contributing to Wikipedia or the FSF. Most users who write something for Wikipedia don't want anything to do with someone else's complex political agenda.
Additionally, the "Reporting Violations of GNU Licenses" page illustrates just how ill-fitting this license is to the Wikipedia project.
I'd be interested to hear what others have to think. I don't know much about licenses, but I suspect Wikipedia is going about this very very wrongly.