Here is a snip of a great article explaining Virus Spoofing from www.lse.ac.uk:

Email-distributed viruses that use spoofing, such the Klez or Sobig virus, take a random name from somewhere on the infected personís hard disk and mail themselves out as if they were from that randomly …

Google SMS (Short Message Service) enables you to easily get answers to specialized queries from your mobile phone or device. Send your query as a text message and get phone book listings, dictionary definitions, product prices and more. Just text. No links. No web pages. Just the answers you're looking …

Part three and the final installment, so far, in securing your web server by the crew at securityfocus.com.

Securing MySQL: step-by-step