If you read Slashdot.org, you may have caught this news story. In short, Nielsen Media Research sent a DMCA takedown order to Wikipedia, asking them to takedown a series of catagory boxes and templates for organizing radio and TV stations by city, stating that it infringed on their copyright on the practice of organizing television and radio stations by market. Consequently, the Wikipedia foundation was forced to delete all the relevant templates, leaving the userbase scrambling to find a way to organize media articles without getting sued.
To be frank, the actions of Neilsen Media Research are a crock of bullshit. The copyright in question is no better, and in fact is almost worse then some of the bogus submarine patents that you read about weekly, and the copyright in question essentially gives the Nielsen essentially a monopoly on the classification and organization of broadcast stations by geography.