To add to this:
If you use PayPal or Ebay, sooner or later you'll recieve e-mails from con-artists. They'll tell you that you need to update your infromation or they'll say there was a transaction that you need to follow through on. These e-mails look and sound like they're coming from these sites.
Any e-mail that seems even slightly suspicious should be forwarded to either
spoof@ebay.com for
spoof@paypal.com. They will then respond with whether or not it is authentic.
Don't take any chances.
Mark