The latest virus circulating the internet is the UPS/Fed Ex/USPS Delivery Failure. You may receive an e-mail from UPS, Fed Ex, or USPS along with a packet number. It will say that they were unable to deliver a package sent to you on such-and-such a date. It then asks you to print out the invoice copy attached.
DO NOT TRY TO PRINT THIS, IT LAUNCHES THE VIRUS!
Please pass this warning on to all your PC operators at work and home.