There is a terrific PDF (warning — its 105 pages) on the Seven Sins of Fund Management. It is a behavioural critique by James Montier, the Global Equity Strategist of Dresdner Kleinwort Wasserstein, and its full of all sorts of smart observations, backed up with data and charts.
I haven’t read prior work of Mr. Montier — but this PDF made me interested in his book, "Behavioural Finance: A User’s Guide."
I may be referencing parts of the PDF in the future, but if you want an overview, here are the 7 Deadly Sins:
Sin 1 Forecasting
The folly of forecasting: Ignore all economists, strategists & analysts
Do analysts understand value: who is the greater fool?