You know all about phishing scams, right? You know better than to click on a Web link embedded in an e-mail that purports to be from your bank, or to reply to messages requesting your user name and password. But if you think that's enough to protect yourself, think again. A phishing scam currently spreading online works without your ever having to click on a link; all that's required to activate the scam is for you to open an e-mail. And, many security experts warn, this threat may be a sign of things to come. "This style of attack is...