Late last week, I discovered that a large publisher was using some materials I wrote and published under the OPL on their website. Not a big deal except that 1) they didn't reference the OPL at all, and 2) they posted it with their own copyright notice.
After I got over my initial indignation, I realized that this was probably an act of negligence, not one of malice. I was able to contact some people in their online division, and after asking them to fix the issue it looks like everything will be resolved this week.
Yeah for friendly discussion!