Money causes people to do strange things and so cybercrime is running rampant. BusinessWeek has a story online, "Meet the Hackers," with a subtitle that reads "Cybercrooks are stealing billions. An inside look at law enforcement's biggest targets."
The article is an interesting read. Just keep in mind that the most effective criminals go undetected for long periods of time, if not indefinitely. So in other words, "Meet the Hackers" won't clue you in about the biggest fish.