One of the first major stories on Lehman Brothers was The New York Times' piece "Report Details How Lehman Hid Its Woes." Their Lehman category has many more articles, and is sure to have more.
After the Enron scandal broke and the key details emerged, The Washington Post did an excellent five-part series it ran over the course of the week. I remember I saved them up and read them all at once, flipping back though the articles to look at charts and key passages again. I also checked out one of the earlier books on the Enron scandal from the library (at least two other good ones came out later). The Enron accounting scams were complex and their mechanics were difficult to understand because they were designed to be that way. One of the better scenes in Michael Moore's (good but uneven) film Capitalism: A Love Story shows him talking to a Wall Street guy who's trying to explain how Credit Default Swaps and some other fancy financial tricks work. The guy also says that if, as a regulator you came into a Wall Street firm and could actually understand what they were doing - the implication being you could put a stop to it - they'd offer you a job.
It's not that hard for financial companies to make profits, even ridiculously high profits, without completely screwing over their customers and destroying the world economy. There needs to be much greater oversight of these companies, whether it's through new regulations, greater enforcement of the existing ones, or a robust Consumer Protection Agency. Really, all three are needed. However, investigating, prosecuting and imprisoning some of high-ranking scoundrels at Lehman Brothers and other firms would also go a long way toward curbing this sort of unethical, reckless behavior.