It seems like, through the Internet, we're alerted to cases of "plagiarism" more than normal, mostly because nothing leads to comments better than someone writing, "The Black Eyed Peas are no talent assholes who steal their music!!!!!"
But it's interesting to see all of the plagiarist rip-offs in commercials, because it's like people that "interpret" popular songs for ads that can't afford the original think they can't be caught. Like this ad for Audi in Germany that totally jacks Eminem's "Lose Yourself" that Eminem is trying to get taken off the air. It's a little bit more nu-metal than the original, obviously, but this is pretty much "Lose Yourself."