Sunday ended a great team's hopes, two months after the Giants' star receiver shot himself in the foot, so to speak. Plaxico Burress' absence at Sunday's playoff was a contributing factor to the Giants' lackluster loss to the Eagles, as New York failed again and again to gain on fourth downs.There are many ways investors can shoot themselves in the foot. But the chief one is failing to do their homework. Investors may be in for a fall whenever they hand their money to investment managers, who won't disclose their strategies or open their books to outside auditors. Investors who accepted Bernard Madoff's lack of transparency are ruing the day. Blind trust in a fund manager, based on reputation alone, now seems like a quaint idea.