Apple announced a couple days ago that a small percentage of their video iPods shipped after September 12th 2006 might contain a windows virus RavMonE.exe. The virus propagates itself through mass storage devices so if the virus is detected on your iPod you should scan all the other storage devices you plug into your computer as well. The good news is the virus is detectable through most of the current anti-virus programs. All you have to do is plug your ipod to your computer, run the antivirus and if your iPod is one of the few lucky unlucky ones the virus detector will find it. On more details read the apple article.