Here's an interesting one. Peripherals manufacturer I-O Data has shipped a series of nice-looking portable hard drives in the 40GB to 120GB range - carrying the Backdoor.Win32.Tompai trojan on them.
This simple trojan isn't particularily new - we added detection for it in September 2004. However, somehow it managed to find it's way to the master image that was preinstalled to every new hard drive. The manufacturer is now replacing them under warranty.
Previously, we've seen similar cases with preinfected laptops, floppy disks, USB memory sticks and even preinfected MP3 players.