Computer users are being urged to be on guard for a bogus e-mail that pretends to offer news updates about Hurricane Katrina as a means to infect their PCs. The malicious e-mail gives a brief news bulletin on the disaster before urging people to click "read more" and be taken to the full story on a website. Yet once directed to the website, a virus is sent to the user's computer. People are also being told to watch out for fraudulent e-mail scams pretending to raise cash for Katrina victims. It's sickening to think that hackers are prepared to exploit...