purportal.com is a nice resource to check before you forward the latest urban legend/chain letter/virus warning to all of your friends. It allows you to search several authoritative hoax, urban legend, and computer security sites to verify whether a story is real or just another chain letter scam making its rounds. As a humorous aside, this site has a nice rant on some of the more egregiously annoying forwards that have made their rounds in the past.