This Sports Illustrated article was really, really interesting. It is basically a tell-all account of an agent, including specific mentions of 30+ players that he paid while he was an agent. It's worth the time to read. The whole thing is worth a read, but here's one of the concluding paragraphs, on why the guy is now speaking. I guess I knew this type of thing went on, but I didn't realize it was as extensive as it is made out to be in the article.